Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This artificial cave looks like something out of a fairytale.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

Macabre astrological automaton clock dating to the late 1400s.

Two old windmills got a new life as oversized sculptures of a man and a woman.

Mysterious craters may have been home to an ancient cult.

Inside this medieval church resides a unique set of murals.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This 1920s Dutch barge is now a floating bookstore.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

This Sheffield sculpture composed of 17,000 Allen keys honors both urban falcons and a furniture icon.

In a quiet hamlet above Penistone, these village stocks are still standing.

Only two of these trees remain in the natural world, found high in the cloud forest of the island of Mauritius.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

In this Romani neighborhood lies a museum dedicated to the culture and history of the Roma.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Walk in the footsteps of the gods and straddle two tectonic plates.

A massive, abstract lookout tower providing a panoramic view of Prague.

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.