The Eiffel Tower: How Gustave Eiffel Built the World's Most Controversial Iron Tower in 793 Days

In 1887, Parisians called it an eyesore and 300 artists signed a petition to stop it. Two years and 2.5 million rivets later, the 'temporary' iron tower became the world's most visited monument — and just last week, 14 of its original steps sold at auction for €450,160.

A daily 1-minute video series uncovering how the world's most iconic structures were built — from ancient wonders to modern skyscrapers.