The Eiffel Tower is a world-famous landmark located in Paris, France. It was built by Gustave Eiffel for the 1889 Exposition Universelle (World's Fair) to commemorate the centennial of the French ...

A structure is a 3D shape made ... idea! Triangles are used in lots of structures. They're used on bridges, masts of ships, roofs. Richard: You can see triangles in the Eiffel Tower!