Paris & the Eiffel Tower

Imagine standing in a grassy park in Paris just as the sky turns deep, velvety blue. Above you rises a giant made of iron, taller than an 80-storey building, its four huge feet planted like a friendly monster stretching up to tickle the clouds. Then, exactly on the hour, something magical happens. Twenty thousand tiny lights begin to flash all over the giant's body, and for five whole minutes the Eiffel Tower glitters like someone shook a jar of stars over it.

All around you, people gasp. Some have travelled from the other side of the world just to see this. About seven million visitors climb the tower every year, which makes it one of the most visited monuments on Earth. But here is the astonishing part: this tower was never supposed to still be here. It was built as a temporary attraction, like a carnival ride, and the plan was to tear it down and sell it for scrap metal.

So why is it still standing? The answer involves invisible waves, a secret apartment in the sky, and a tower that secretly grows taller in summer. Ready? Let's climb into the story.

Our story begins in the 1880s, when France decided to throw the biggest party the world had ever seen: the 1889 World's Fair in Paris. Countries would show off their cleverest inventions, from talking machines to electric lights. But France wanted something more, a single jaw-dropping centrepiece that would make every visitor say, 'Only in Paris!'

So a contest was announced: design a tower 300 metres tall, far taller than anything humans had ever built. More than one hundred ideas poured in, and some were wonderfully weird. One dreamer suggested a giant sprinkler that could water all of Paris if the weather got too dry. Another wanted an enormous stone tower, but stone that tall would be so heavy it might squash itself.

The winning idea came from the workshop of Gustave Eiffel, a famous engineer whose company built bridges all over the world. Actually, here is a secret most visitors never learn: Gustave did not sketch the tower himself. Two engineers who worked for him, Maurice Koechlin and Émile Nouguier, drew the first design. Eiffel saw the sketch, felt a spark of excitement, improved it with an architect's help, and bought the rights. The iron giant was about to be born.

Building the tower was like assembling the world's biggest construction kit. Every single piece was made in Eiffel's factory on the edge of Paris, then carried to the site by horse-drawn wagons. There were 18,038 iron pieces in total, and every hole for every rivet was drawn on plans in advance, accurate to a tenth of a millimetre. That is thinner than a single sheet of paper!

Rivets are like metal buttons that hold iron pieces together, and the tower needed about 2.5 million of them. Riveting teams worked in groups of four: one heated the rivet until it glowed orange like a tiny sun, one held it in place, one steadied the piece, and one hammered it tight. As the rivet cooled, it shrank and squeezed the iron together with incredible strength.

Around 300 workers built the whole tower in just two years, two months and five days, which amazed everyone. When it opened in 1889, it stood 300 metres tall and weighed about 7,300 tonnes in iron alone, roughly the weight of 1,500 elephants. It was the tallest structure humans had ever built, and it kept that record for over forty years.

Believe it or not, when Parisians first heard about the tower, many were furious. Before a single piece of iron went up, a group of famous artists and writers published an angry letter in the newspaper. They called the tower useless and monstrous, and said it would loom over Paris like a giant black factory chimney. Some people nicknamed it 'the metal asparagus.' Imagine calling the world's most beloved tower a vegetable!

One of the protesters was Guy de Maupassant, a famous writer. A funny story says that after the tower was built, he often ate lunch at the restaurant inside it. When people asked why he would eat in the very tower he hated, he supposedly replied that it was the only place in Paris where he did not have to look at the thing.

But then something wonderful happened. When the tower opened, ordinary Parisians fell head over heels in love with it. Nearly two million people visited during the fair, climbing its stairs and gasping at the view. Even some of the grumpy artists changed their minds. It is a good reminder that new ideas often look strange at first, right before they become treasures.

Now for the twist at the heart of our story. The Eiffel Tower was never meant to be permanent. The city of Paris gave Gustave Eiffel permission to keep his tower standing for exactly twenty years. After that, in 1909, the city could order it torn down, and the iron would likely be sold for scrap. Imagine building the tallest structure on Earth knowing it came with an expiry date, like a carton of milk!

Gustave Eiffel, however, was not the sort of person to give up. He loved his tower the way you might love a pet, and he hatched a clever plan: if the tower could prove it was useful for science, nobody would dare demolish it.

So he turned it into a giant laboratory in the sky. He installed weather instruments at the top to measure wind, temperature and air pressure. He studied how air pushes against falling objects by sliding test shapes down a cable from the second floor. He even built a wind tunnel at the tower's base to study how air flows, research that later helped the very first aeroplanes. The tower was busy earning its keep. But would that be enough?

What truly saved the tower was something you cannot see at all: radio waves. In the 1890s, scientists discovered that messages could fly invisibly through the air, with no wires needed. But there was a catch. To send radio signals a long way, you needed a very tall antenna. And what was the tallest thing in the entire world? You guessed it.

In 1898, an inventor named Eugène Ducretet sent one of the first radio signals in Paris from the top of the tower to a building four kilometres away. Soon after, the French army began experiments of its own, and before long the tower could exchange messages across enormous distances. Suddenly this 'useless' iron giant was one of the most useful objects in France. When the twenty-year deadline arrived in 1909, the city renewed Eiffel's permission. The tower had saved itself.

From 1910 it even broadcast time signals so that ships far out at sea could set their clocks precisely. And the tower never stopped working. Today, antennas at its tip beam radio and television programmes across the region, and they push its total height to 330 metres. The rescue antenna is still on duty.

Here is a secret that makes visitors gasp: near the very top of the tower, almost 300 metres above the streets, Gustave Eiffel built himself a small private apartment. While the rest of the tower was busy iron and rivets, this hidden room was cosy and warm, with patterned wallpaper, wooden cabinets, soft chairs and even a grand piano. It was like a snug little house floating among the clouds.

Rich Parisians were wild with jealousy. Some offered Eiffel large piles of money just to spend a single night up there. He always said no. The apartment was not for parties; it was his quiet thinking spot, a place to work, rest and welcome very special guests.

And what guests! In September 1889, the American inventor Thomas Edison climbed up for a visit. Edison gave Eiffel one of his newest inventions, a phonograph, a machine that could record and play back sound, and the two inventors sat high above Paris talking about the future. Today, visitors who ride to the top can peek through a window into the apartment, where wax figures of Eiffel and Edison sit mid-conversation, frozen in that amazing moment forever.

Would you believe the Eiffel Tower changes size? It really does. On a hot summer day, the tower can grow up to about 15 centimetres taller, roughly the length of a new pencil. Then, when winter comes, it shrinks back down again. No magic is involved, just wonderful science.

Here is how it works. Everything around you is made of tiny particles called atoms, far too small to see. When iron gets warm, its atoms jiggle around more energetically and push a little farther apart from each other. Billions and billions of atoms each nudging just a tiny bit apart adds up, and the whole tower stretches taller. Scientists call this thermal expansion. When the iron cools, the atoms calm down, huddle closer, and the tower shrinks.

The sun plays another trick too. On sunny afternoons, one side of the tower gets hot while the shady side stays cool. The sunny side expands more, so the top of the tower actually leans gently away from the sun, sometimes by more than 15 centimetres, following it around like a shy sunflower in reverse. Engineers knew all this would happen and designed the tower to bend and breathe safely.

If iron gets wet, it rusts, and rust slowly eats metal the way moths eat old sweaters. So how has an iron tower survived outdoors for more than 130 years? The answer is paint, and lots of it. Gustave Eiffel said that paint was the guardian of his tower, and he ordered it repainted regularly, roughly every seven years. That tradition continues today.

Here is the astonishing part: the tower is still painted by hand, with brushes, just as it was in 1889. No giant spray machines are allowed, because spray paint would drift onto the streets and the river below. Instead, a small team of about 25 specially trained painters clips onto safety ropes and climbs over the iron like careful spiders, brushing paint into every nook and cranny. A full repaint uses around 60 tonnes of paint, about the weight of ten grown elephants.

And here is a secret most visitors never notice: the tower is not all one colour. It is usually painted in three slightly different shades, darkest at the bottom and lightest at the top. This clever trick fools your eyes so the tower looks perfectly even against the bright Paris sky.

Next time you see a photo of the Eiffel Tower, look closely just under the first balcony. Painted in golden letters around all four sides are 72 names. Gustave Eiffel had the names of 72 great French scientists, engineers and mathematicians written onto the tower, people who studied everything from electricity to chemistry to the mathematics of bridges. It was his way of answering the artists who called the tower ugly: this tower, he was saying, is a monument to science.

The tower also puts on a nightly show. Its golden glow comes from hundreds of projector lamps, and the famous five-minute sparkle is created by 20,000 flashing bulbs that were installed for the year 2000 celebrations. Parisians loved the twinkle so much that it never went away. At the very top, a lighthouse-style beacon sweeps the sky, and its beams can be seen from roughly 70 kilometres away.

One more surprise: the tower barely moves, even in strong wind. Storms may push the top only a few centimetres, because its curved shape lets wind slip smoothly around it. Eiffel calculated those elegant curves with mathematics. The tower's beauty and its strength are the very same thing.

Long before the tower rose, Paris was already reaching for the sky. In 1783, two French brothers named Joseph and Étienne Montgolfier, who ran a paper factory, noticed that hot air rises. They built enormous balloons of paper and cloth, lit a smoky fire underneath, and watched them float upward like giant soap bubbles.

Before risking any people, they ran a test with the world's strangest flight crew: a sheep, a duck and a rooster. The sheep was named Montauciel, which means 'climb to the sky.' In front of the king and a huge crowd at Versailles, the three animals sailed up into the air and landed safely a few minutes later, probably very confused but perfectly fine.

Then, on 21 November 1783, two brave men, Pilâtre de Rozier and the Marquis d'Arlandes, stepped aboard a beautiful blue-and-gold balloon and lifted off over Paris. For about 25 minutes they drifted above rooftops and gardens, becoming the first humans in history to fly. The American scientist Benjamin Franklin, who lived in Paris then, watched in wonder. When someone asked what use a balloon could possibly be, he replied, 'What use is a newborn baby?' Great things start small.

Here is a puzzle from long ago: how long is a metre, and who decided? Before the 1790s, measuring was a mess. Almost every town in France had its own units, often based on the length of someone's foot or arm, so a 'foot' in one village might be longer than a 'foot' in the next. Buying cloth or land turned into an argument waiting to happen.

Scientists in Paris proposed something breathtaking: let's invent a measurement that belongs to everyone, based on the Earth itself. They decided one metre would be exactly one ten-millionth of the distance from the North Pole to the equator, measured along a line running through Paris. To figure that out, two astronomers, Delambre and Méchain, spent about seven years travelling with telescopes, climbing towers and mountaintops, carefully measuring a slice of the planet.

From their work, France created the metric system: metres, litres, grams, all connected by tens, easy to calculate with. Today nearly every country on Earth uses it. And here is a treat for sharp-eyed explorers: a few original 'standard metre' markers, installed so citizens could check their measuring sticks, still survive on Paris walls. You can find one near the Luxembourg Gardens.

In the 1850s and 1860s, a scientist in Paris named Louis Pasteur peered into microscopes and explored a hidden universe: the world of microbes, living things so tiny that millions could fit on the dot of this letter i. Pasteur showed that some of these invisible creatures make food go bad and can make people and animals sick. At the time, many scientists refused to believe it. Tiny invisible animals causing big problems? Ridiculous! But Pasteur proved it with careful experiments.

He discovered that gently heating drinks like milk, not boiling them, just warming them enough, kills the harmful microbes while keeping the taste. This trick was named after him: pasteurization. Look at a milk carton in almost any country today and you may find the word 'pasteurized' hiding there, a little tribute to a curious Frenchman.

Pasteur also helped invent vaccines, which teach your body to fight off diseases before they can hurt you. His work has protected countless children and animals around the world. In 1888, the Pasteur Institute opened in Paris, and its scientists are still hunting microbes and inventing cures today. Not bad for a man who loved asking, 'But why does that happen?'

One of the most important inventions in history was created in Paris by a teenager. Louis Braille lost his sight in an accident when he was very young, growing up in a village near Paris. He was brilliant and determined, and he won a place at a special school in Paris, the Royal Institute for Blind Youth.

At the school, books for blind readers had huge raised letters that you traced slowly with a finger. Reading a single page took forever, and the giant books were heavy as bricks. Then a soldier named Charles Barbier visited, showing a code of raised dots he called night writing, invented so soldiers could read messages in the dark. It was clever but far too complicated, using twelve dots.

Young Louis had a flash of genius. He simplified the system to just six dots, arranged in a small cell that fits perfectly under one fingertip, with different dot patterns for every letter. He finished the heart of his system by age fifteen, around 1824. Today braille is used in almost every language on Earth, on books, elevator buttons, medicine boxes and bank notes. Louis Braille is now honoured in the Panthéon, the resting place of French heroes.

On 28 December 1895, in the basement room of a grand café in Paris, something happened that changed entertainment forever. Two brothers, Auguste and Louis Lumière, had invented a machine called the Cinématographe. It could record moving pictures and project them onto a screen for a whole room to watch together. That winter evening, they held the first public film screening where ordinary people bought tickets, one franc each. About 33 curious customers came.

The films were tiny by today's standards, each lasting less than a minute. One showed workers streaming out of the Lumière family factory. Another showed a baby eating breakfast. But to the audience, photographs that moved seemed like pure magic. A famous story says that when a later film showed a train pulling into a station, some viewers flinched or jumped, half-convinced the train might burst out of the screen!

Within weeks, crowds were lining up around the block, and within a few years, moving pictures spread across the entire world. Every film you have ever loved traces back to that little basement room in Paris. Delightfully, the brothers' name fit perfectly: Lumière is the French word for light.

In 1891, a brilliant young woman named Marie travelled from Warsaw to Paris, because the University of Paris allowed women to study science, which was rare at the time. She was often cold and hungry in her tiny attic room, but she graduated first in her physics class. She married a scientist named Pierre Curie, and together they made discoveries that changed the world.

Working in a leaky old shed, Marie and Pierre found two brand-new elements, kinds of atoms nobody had ever identified. She named one polonium, after Poland, her homeland, and the other radium. These elements constantly release invisible energy, and Marie invented a word for that: radioactivity. Radium salts even glowed faintly in the dark, and the couple sometimes visited their shed at night just to admire the ghostly blue-green light.

Marie Curie became the first person ever to win two Nobel Prizes, in two different sciences, physics and chemistry, and the first woman professor at the University of Paris. Her discoveries led to treatments that help doctors fight cancer today. And here is an amazing detail: her old notebooks are still so radioactive that they are stored in special protective boxes, more than a century later.

In the heart of Paris stands the Louvre, the largest art museum in the world. It began its life over 800 years ago, not as a museum at all, but as a fortress with thick walls and a moat. Later, kings transformed it into a glittering palace and filled it with paintings, sculptures and treasures. A little over two hundred years ago, something wonderful happened: the palace was opened to everyone, so that ordinary people, not just royalty, could enjoy the art.

Today the Louvre displays around 35,000 artworks, and hundreds of thousands more rest in storage. The building is so enormous that if you paused for just 30 seconds at each displayed piece, seeing everything would take you months of full-time looking. Visitors' feet famously ache long before their curiosity runs out.

In the courtyard stands a surprise from our own era: a great glass pyramid, finished in 1989 as the museum's entrance. Designed by the architect I. M. Pei, it is made of 673 panes of glass. Some Parisians grumbled that it was too modern, just as their great-grandparents had grumbled about a certain iron tower. Now, of course, the pyramid is beloved too. Paris has a pattern!

Deep inside the Louvre hangs the most famous painting on Earth: the Mona Lisa, painted by the Italian genius Leonardo da Vinci more than 500 years ago. How did an Italian painting end up in France? Near the end of his life, Leonardo was invited to France by King Francis I, and he brought his favourite painting along in his luggage. He never gave it back to Italy, and after his death it stayed with the French kings.

First-time visitors are often shocked by how small it is: just 77 centimetres tall and 53 wide, about the size of an oven door. It hangs behind special protective glass while crowds hold up phones to photograph its mysterious little smile.

But here is a secret: the Mona Lisa was not always this famous. What made her a superstar was a crime! In 1911, a museum worker hid overnight, lifted the painting off the wall, and simply walked out with it under his coat. Newspapers around the world exploded with the story, and people queued just to stare at the empty space. Two years later the painting was found safely in Italy, and by then, everyone on Earth knew her face.

Here is a secret hiding right under Parisians' feet: there is another Paris underground. For many centuries, builders dug deep beneath the city to mine a creamy stone called limestone, the very stone used to build many of the elegant buildings above. In a way, Paris was pulled up out of its own ground! All that digging left behind a maze of tunnels stretching for roughly 300 kilometres, farther than the distance from Paris to Brussels.

A small section of these tunnels became the famous catacombs. Long ago, when the city's old cemeteries grew too full, Parisians respectfully moved the remains of millions of people from earlier centuries down into the quiet stone passages, arranging them with great care. Today, a short stretch is open as a memorial and museum, a solemn, fascinating place where visitors walk through deep history. The rest of the tunnel maze is closed, mapped only by special inspectors who check that the city above stays safe.

The underground holds gentler surprises too. Beneath the grand Paris opera house lies an actual pool of water, a hidden reservoir, where firefighters sometimes practise swimming in the dark. A lake under an opera house! Paris keeps secrets in every direction, even straight down.

You cannot tell the story of Paris without bread. The baguette, that long, golden, crackly loaf, is so important to France that there is an actual law about it. Since 1993, a traditional French baguette may contain only four ingredients: flour, water, salt and yeast. Nothing else. No shortcuts, no mystery powders. It must be mixed, shaped and baked with care, and bakers guard their methods like treasure maps.

The numbers are enormous. France bakes several billion baguettes every year, which works out to millions every single day. Many French people buy a fresh one daily, still warm, and it is considered completely normal to nibble the end of the loaf on the walk home. That crunchy tip even has a name: le quignon.

Every year, Paris holds a grand competition to crown the city's best baguette. Judges examine the crust, the crumb, the smell and the all-important crackle. The winning baker receives a wonderful prize: the honour of delivering bread to the president's palace for a whole year. In 2022, the baguette was added to UNESCO's list of the world's treasured cultural traditions. Not bad for flour, water, salt and yeast.

In the summer of 1900, Paris opened something revolutionary beneath its streets: the Métro, an underground railway. The very first line carried passengers between the city's gates in time for that year's World's Fair, and Parisians were amazed. A train under the ground! No horses, no traffic, just a smooth ride through the dark.

The entrances were works of art. A designer named Hector Guimard created swooping green archways of iron and glass that look like giant plant stems or dragonfly wings sprouting from the pavement. Many still stand today, and they are protected as historic monuments. Imagine an entrance to a train station so beautiful that museums want one; in fact, some museums abroad display originals.

Today the Métro has around 300 stations woven so tightly through the city that in central Paris you are almost never more than a few minutes' walk from one. Some lines now run with driverless trains, gliding along automatically. And here is a secret for explorers: hidden in the tunnels are ghost stations, closed long ago, their platforms standing silent in the dark. Some are occasionally borrowed by film crews, so a movie's underground scene may be an actual abandoned Paris station.

On an island in the River Seine stands Notre-Dame cathedral, begun more than 860 years ago and built over nearly two centuries by generations of stonemasons, carpenters and glassmakers, most of whose names we will never know. In 2019, a terrible fire damaged its roof and toppled its spire, and people around the world watched with heavy hearts.

Then came one of the most inspiring rescue missions in modern history. To rebuild the roof exactly as it was, carpenters chose to work the medieval way: shaping massive oak beams by hand, with axes, just like craftspeople 800 years ago. Many had to relearn these nearly forgotten skills, practising swing after swing until the wood came out perfectly true. More than a thousand oak trees were carefully selected from French forests for the new roof and spire.

Stone carvers repaired sculptures and gargoyles, artisans restored the great windows and organ, and thousands of specialists worked together like a medieval building site brought back to life. In December 2024, Notre-Dame reopened, its bells ringing across Paris once more. The rebuilders proved something wonderful: knowledge from long ago is not lost forever if people care enough to learn it again.

Paris hides treasures for those who look carefully. On the square in front of Notre-Dame, set into the ground, is a small bronze star labelled Point Zéro. It marks the official centre of Paris, and road distances across France are measured from this exact spot. Stand on it, and you are standing at kilometre zero.

Here is another secret with a twist: the Statue of Liberty, New York's famous green giant, is Parisian! She was designed by the French sculptor Frédéric Auguste Bartholdi and built in Paris before being taken apart, packed into hundreds of crates, and shipped to America as a gift of friendship. And guess who engineered the iron skeleton hidden inside her, the framework that lets her stand strong in storms? Gustave Eiffel, a few years before he built his tower. A smaller Liberty stands on an island in the Seine, gazing toward her big sister across the ocean.

There is even a real vineyard in Montmartre, a hillside neighbourhood inside the city, where Parisians harvest grapes every autumn with a joyful festival. A vineyard, a hidden star, and a statue's secret skeleton, and that is only the beginning of the list.

Paris has a glowing nickname: la Ville Lumière, the City of Light. It earned the name twice over. Centuries ago, Paris became one of the first cities in Europe to light its streets at night, first with thousands of lanterns and candles, later with gas lamps, so that evening streets felt safer and sparkled with life. Visitors from darker cities were astonished. But the nickname also means something deeper: Paris shone with the light of ideas, a city where thinkers, scientists, writers and inventors gathered to trade discoveries the way other people trade football cards.

That mixture of light and ideas created historic firsts. In 1838, on a Paris boulevard, the inventor Louis Daguerre made one of the earliest photographs ever taken of a street scene, and it accidentally captured a man standing still to have his boots shined, possibly the first photograph of a person in history.

Think about everything from our journey: flying balloons, the metric system, pasteurized milk, braille, the movies, radioactivity, and a tower saved by radio waves. One city gave the world all of it. When the Eiffel Tower sparkles tonight, it is really the city's ideas glittering.

Our journey ends where it began, on the grass beneath the iron giant, waiting for the lights. But you know the secrets now. You know the tower was supposed to vanish after twenty years, and survived because it made itself useful. You know about the apartment in the clouds, the paint brushed on by hand, and the iron that stretches in summer sunshine.

Notice something about every hero in this story. The artists said the tower was ugly, and Eiffel built it anyway. People laughed at invisible microbes, and Pasteur kept experimenting. Louis Braille was fifteen, and he still changed reading forever. Marie Curie studied in a cold attic and won two Nobel Prizes. The Notre-Dame carpenters picked up medieval axes and taught their own hands an ancient craft. Again and again, the pattern repeats: curiosity, courage, and stubborn, patient work.

So here is the real secret of Paris, the one most visitors never learn: wonders are not found, they are made, by ordinary people who refuse to stop asking questions. Somewhere out there is a problem waiting for you, an idea only you will think of. Start sketching. Start asking. Your tower, whatever it turns out to be, is waiting.