This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

The patron saint of spinsters grasps a container of dried blood.

The unusually large seat sits atop the base of a ruined temple.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The footprint of a frustrated devil in Munich's Cathedral.

A fearsome dragon clings to a corner of Munich's city hall.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

This banal Parisian entranceway is not what it seems.

A remarkably well preserved tower dating all the way back to the Iron Age.

This professional clown's home is an outsider art wonderland.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

These beautiful objects represent beautiful ideas.