Construction Timeline
Building the Impossible.
1887–1889.
Two years, two months, and five days. 300 workers. 18,038 iron pieces. 2.5 million rivets. Zero room for error.
Foundations Begin
On January 28, 1887, excavation started on the Champ de Mars. The four massive foundation pads required digging 15 meters below ground on the Seine side, where waterlogged soil demanded the use of compressed-air caissons — a technique Eiffel had perfected building bridge piers. Each of the four legs rests on a concrete block approximately 10 meters square, anchored by metal bolts driven 7 meters deep.
The Iron Rises
By March 1888, the first floor platform was complete at 57 meters. The four legs, built at a carefully calculated angle, met with mathematical precision — the error at the junction was less than 7 centimeters. Twelve temporary wooden scaffolds, each 30 meters tall, supported the legs until they could be joined. Sand-filled hydraulic jacks allowed millimeter adjustments. The second floor followed by August 1888.
Summit Reached
On March 31, 1889, Gustave Eiffel himself climbed the 1,710 steps to plant the French tricolor at the summit, exactly 300 meters above Paris. The tower was the tallest structure ever built by humans, surpassing the Washington Monument's 169 meters. The final structure used 7,300 tons of puddled iron, held together by 2,500,000 rivets, and could sway no more than 12 centimeters in high winds.
Open to the World
The Eiffel Tower opened to the public on May 6, 1889. Because the lifts were not yet operational, the first visitors climbed the stairs. Among the early guests was Thomas Edison, who visited Eiffel in his private apartment at the summit and gifted him a phonograph. During the six-month Fair, 1,896,987 visitors ascended the tower — an average of more than 10,000 per day.