Iron Lady: Eiffel Tower

You've likely seen countless photos of the Eiffel Tower, but you probably don't know its full story. Behind its elegant silhouette lies a construction feat that shocked the world, a near-demolition, and a surprising second life as a scientific instrument. The numbers alone tell a remarkable tale. Stick around — what you'll discover about this iron giant might completely change how you see it.

Key Takeaways

• Built in just over 2 years, the Eiffel Tower used 18,038 metal parts and 2.5 million rivets to reach 300 meters.
• The tower was originally temporary, planned for demolition after 20 years before scientific uses secured its permanent status.
• Every seven years, 25 painters spend 18 months applying 60 tons of paint across 200,000 square meters of iron lattice.
• Thermal expansion causes the tower's height to vary by up to 15 centimeters depending on surrounding air temperature.
• Since 1889, approximately 250 million visitors have climbed the tower's 1,665 steps to reach its summit.

How the Eiffel Tower Was Built in Just Over 2 Years

The Eiffel Tower's construction began on 26 January 1887 and was completed in just 2 years, 2 months, and 5 days — finishing on 31 March 1889. You'd be amazed at how prefabrication precision made this possible. Eiffel's Levallois-Perret factory produced 18,000 pieces, each calculated to a tenth of a millimeter, then assembled into five-meter sections before reaching the site.

Workers used temporary scaffolding — twelve 30-meter and four 40-meter wooden structures — to complete the first level by December 1887. Sand boxes and hydraulic jacks kept positioning accuracy within one millimeter. Steam cranes hauled pieces upward as each floor rose. The first floor was done by April 1888, the second by August 1888, and the full tower by March 1889. Overseeing the assembly was a team of constructors with deep experience in metal viaduct projects, who managed between 150 and 300 on-site workers throughout the build.

The Seine-side foundations required a particularly ingenious solution, as builders used watertight metal caissons filled with compressed air to work safely below the water level. Much like the pietra dura inlay technique used in the Taj Mahal's intricate marble decoration, the Eiffel Tower's construction demanded extraordinary artisanship, with each of its 18,000 components crafted to exacting tolerances that left virtually no room for error.

18,038 Iron Parts and 2.5 Million Rivets: The Build by Numbers

Behind that two-year construction sprint lay an extraordinary set of numbers that tell the tower's real story. You're looking at 18,038 individual metal parts, each engineered to within one-tenth of a millimeter. The metal supply chain delivered 7,300 tonnes of puddled iron — a low-carbon material offering three times the tensile strength of cast iron.

Connecting every piece required 2.5 million rivets, and rivet ergonomics demanded four workers per fastening: one heating, one positioning, one shaping, one hammering. That thermal contraction created joints tight enough to hold for over a century.

Workers positioned massive girders using only sand boxes and hydraulic jacks, achieving one-millimeter accuracy. The iron's sensitivity to temperature means the tower's height can shift by up to 15 centimeters depending on the surrounding air temperature. These numbers aren't just impressive — they explain exactly why the structure still stands today. Much like Hokusai's The Great Wave, which was produced using Prussian Blue pigment to achieve deeper and more vibrant colors than traditional dyes allowed, the Eiffel Tower's lasting impact owes as much to its innovative materials as to its construction methods.

The tower's total weight reaches 10,100 tonnes, though the iron structures alone account for 7,300 tonnes of that figure.

How the Eiffel Tower Became the World's Tallest Structure

When France organized the International Exposition of 1889 to commemorate the French Revolution's centenary, they needed a monument worthy of the occasion. Over 107 competition designs were submitted, but Gustave Eiffel's iron tower stood apart. Designed alongside Maurice Koechlin, Emile Nouguier, and Stephen Sauvestre, this engineering feat rose 300 meters above the Champ-de-Mars, claiming the height record as the world's tallest structure.

Construction began January 26, 1887, completing in just 2 years, 2 months, and 5 days. Eiffel's team used precision techniques — hydraulic jacks and sand boxes achieving one-millimeter accuracy — to assemble the open-lattice wrought iron tower. It served as the Exposition's entrance gateway and held its record until New York's Chrysler Building surpassed it in 1929, a remarkable 40-year reign. To extend its lifespan beyond the fair, the tower was repurposed as a meteorological station in 1890, proving its value far beyond its original ceremonial role.

Despite its enduring fame, the tower was originally a temporary structure, intended to be dismantled just 20 years after its construction before its scientific and communication uses ultimately secured its permanent place in the Parisian skyline. Much like Barcelona's Sagrada Família, which has been under construction for over 140 years and is funded entirely by private donations, the Eiffel Tower's longevity ultimately depended on public support and demonstrated utility rather than its original design mandate.

Floors, Steps, and the 250 Million People Who've Climbed Them

Standing at the base of the Eiffel Tower, you're looking up at a structure with 1,665 steps stretching from ground to summit — though you'll only climb 674 of them. Public stair access runs through the South pillar, taking you up 360 steps to the first floor and 314 more to the second. Expect a 30-to-45-minute climb.

Beyond the second floor, stairs no longer exist for visitors — the spiral staircase connecting to the summit was dismantled in 1983. From there, you'll take an elevator up.

Visitor statistics tell an impressive story: roughly 250 million people have made this climb since 1889. If you're feeling competitive, the tower's Vertical Race record sits at just under 8 minutes for men and 10 for women. Stair access tickets to the second floor are priced at €10.70 for adults and €5.40 for visitors aged 12 to 24.

Choosing the stairs over the elevator comes with a practical advantage — stair queues typically run around 30 minutes, compared to elevator lines that can stretch beyond three hours on busy days.

The Science That Saved the Eiffel Tower From Demolition

Few structures have survived on scientific merit alone, but the Eiffel Tower is one of them. Built as the centerpiece of the 1889 World's Fair, it faced demolition in 1909 after its temporary permit expired. Critics despised it, and novelist Huysmans openly demanded its removal.

Gustave Eiffel fought back through scientific advocacy, transforming the Tower into a premier meteorological station and wind tunnel research facility. Scientists measured air resistance, studied atmospheric pressure, and tested airplane wing designs using the structure's unique height.

Its military utility proved equally decisive. French army captain Gustave Ferrié used the Tower to establish radio contact with surrounding forts, and by 1908, it was broadcasting wireless telegraph signals across Europe and North America. In 1910, Paris renewed the Tower's permit for 70 more years.

In September 1914, the Tower intercepted a German military message revealing a critical feed shortage, enabling France to transport roughly 5,000 troops to the Marne by taxi and helping prevent the invasion of Paris in what became known as the Miracle of the Marne.

During the 1889 World's Fair, the Tower drew more than a million visitors, demonstrating public fascination with the structure that Eiffel would later fight to preserve as a permanent scientific landmark rather than a fleeting spectacle.

Paint, Lightbulbs, and the Team That Keeps It Standing

Beyond securing its future through science and radio, the Eiffel Tower's survival has depended on something far more hands-on: paint. These historic coatings and maintenance rituals have protected its puddle iron from rust, pollution, and weather for over 136 years.

Here's what makes each repainting campaign remarkable:

1. 25 painters spend 18 months applying 60 tons of paint across 200,000 square meters of iron lattice.
2. No rollers or spray guns—every stroke uses traditional guipon brushes, just as workers did in the 19th century.
3. Three shaded brown tones graduate from darkest at the base to lightest at the apex.
4. Mountaineering techniques, introduced in 1989, help painters safely access the tower's most challenging sections.

The tower undergoes a complete repaint every seven years to prevent rust from taking hold across its vast network of beams, bolts, and crevices. For the 2024 Paris Olympics, the entire Tower was dressed in yellow-brown, the same shade Gustave Eiffel himself chose back in 1907.