PHThe designer of the Eiffel Tower built an apartment into it.
When Gustave Eiffel designed the tower which bears his name, he added a hidden apartment on the third level of the landmark—but he never lived there, no one did.
Instead, Eiffel used the special space to entertain distinguished guests such as Thomas Edison. Although it wasn't big, the apartment was decorated with wallpaper, furnished with wooden cabinets, and even featured a grand piano.
These days, you can get a peek at the unique abode through a window if you purchase a ticket for a ride up the tower.
(s) bestlifeonline