The Eiffel Tower, Paris's tallest structure, is a global icon visited by over 200 million people. Originally built for the Universal Exhibition, it was meant to be temporary but became a permanent fixture. The tower, an engineering marvel, was constructed in 21 months using 18,000 iron components. It weighs 10,000 tonnes and is repainted every seven years. Designed by Gustav Eiffel, it features innovative elevators and lighting. Despite initial criticism, it is now a celebrated landmark.

Who was the chief designer of the Eiffel Tower?

What unique feature do the elevators of the Eiffel Tower have?