French Republic

  When Gustave Eiffel’s company built Paris’ most recognizable monument for the 1889 World’s Fair, many regarded the massive iron structure with skepticism. Today, the Eiffel Tower, which continues to serve an important role in television and radio broadcasts, is considered an architectural wonder and attracts more visitors than any other paid tourist attraction in the world.

  Over the years, the Eiffel Tower has been the site of numerous high-profile stunts, ceremonial events and even scientific experiments. In 1911, for instance, the German physicist Theodor Wulf used an electrometer to detect higher levels of radiation at its top than at its base, observing the effects of what are now called cosmic rays. The Eiffel Tower has also inspired more than 30 replicas and similar structures in various cities around the world.

  Now one of the most recognizable structures on the planet, the Eiffel Tower underwent a major facelift in 1986 and is repainted every seven years. It welcomes more visitors than any other paid monument in the world—an estimated 7 million people per year. Some 500 employees are responsible for its daily operations, working in its restaurants, manning its elevators, ensuring its security and directing the eager crowds flocking the tower’s platforms to enjoy panoramic views of the City of Lights.