This little Greek plateau is home to thousands of rustic, white-sailed windmills.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

This abandoned Belgian fortress is purposefully being left to nature.

What was once a bustling mining installation is now a bustling hub of contemporary art.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

This chimerical bridge/tunnel appears to dead end right into the sea.

A Spanish forest is filled with mysterious stone carvings.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A beautiful but toxic fountain of mercury.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Turntable anonymously received orphans, alms, and groceries.

This former quarry is now a picturesque gorge that hides a sunken lake.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

Countless grotesque faces stare out from this eerie Prague art wall.

This automated sculpture of two men peeing will spell out text messages with their micturition.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A mocking tribute to the past and modern leadership of Prague.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.