The encased skull that is widely believed to belong to St. John the Baptist.

This bridge was constructed from the rubble of the infamous Bastille.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

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

This ancient Visigothic church might hide an ancient treasure.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

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

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

These unique markers designate the route American forces took during the Liberation of France.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Huge Russian Orthodox cemetery in danger of being converted into open public space.

Two small chapels housed inside an ancient tree.

18th century underground pilgrimage site, dedicated to a Saint that did something...

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