Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Abandoned railway line circling the city of Paris.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.