One of the world's most popular and well-known sites, this tower is not only a must-see for visitors but Paris's signature landmark. Although the structure was poorly received when it premiered, it's now a symbol of great civic and national pride. In fact, visitors must often wait in line before taking the elevator to the observation deck and seeing the city spread out below. At night, the tower becomes a beautifully illuminated sculpture. Gustave Eiffel, who designed the tower, also created the framework for NYC's Statue of Liberty.

Source: 10best.com