Eiffel Tower
Paris
Constructed from 1887 to 1889 as the entrance to the 1889 World's Fair. The tower is 324 metres (1,063 ft) tall, about the same height as an 81-storey building, and the tallest structure in Paris. Eiffel Tower is the most-visited paid monument in the world; 6.91 million people ascended it in 2015.