After the fair was over, Eiffel built a lab on the third platform to study the weather. Other scientists also used the tower for experiments. The use of radio signals for communications was growing. In the early 1900s, the tower was used as a giant radio antenna. Visitors continued to flock to the Eiffel Tower. It became a popular spot for tourists and a familiar site for Parisians. Over the years, it became a symbol of the city and one of the most familiar structures in the world.
In the 2000s, the Eiffel Tower still serves the communications industry. More than fifty television stations and thirty-