The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The first green space constructed on an elevated viaduct.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A unique underground structure dating back to the 1st century BC.

Walk through living pictures and music in the Cathedral of Images.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.