The ancient tomb acts as a calendar that keeps perfect time.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

Legend says this cave housed a 16th-century cannibal and his family of 48.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

A museum marks and documents the site of the Titanic's launch.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

A huge Megalithic chamber tomb located behind a cafe.

Figures of unknown origin carved into the surfaces of underground caves.

Beautiful carved tunnels.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

This massive library holds what was once the largest book collection in the world.

A surrealist timepiece by the artist of melting clocks.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

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

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

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

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

The home-turned-museum of Barış Manço, the mustachioed Turkish Elvis for children.