The oldest residential street in Europe also features an optical illusion.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

The final resting place of one of the most influential modern occultists.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Notorious artist squat renovated into legal studios.

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

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.