The highest point in Belgium is a staircase to nowhere.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

The mystery of the Putim Ossuary involves a tricorn hat.

A bus with a butt and biceps to put Olympic athletes to shame.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Dedicated to the unsung history of human waste.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

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

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A Jenga-style cylindrical tower of books that appears to go on forever.

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

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

A gothic church dedicated to the love of wine.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

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

A slice of central Asia in the middle of Berlin.

Home to the world's oldest functioning orrery.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Unchanged for centuries, this medieval library keeps its books in chains.

This miniature take on the Kremlin is one Dutch man's retirement project.

Made of 41,900 pieces of mosaic, it took two years to piece together this giant egg.

One of the oldest masonic temples in the Netherlands, built in 1757.