The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Sleep in a climate-controlled plastic bubble for the night.

Monsters and miniatures are held in equal esteem at this wondrous museum.

A modern-day Lascaux cave underneath Paris.

An antique curios dealer and hybrid taxidermist.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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