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

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

This artificial cave looks like something out of a fairytale.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

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

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The first museum in the world devoted to sexual gadgetry.

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

A church of bones, decorated with 40,000 human skeletons.

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

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

Macabre astrological automaton clock dating to the late 1400s.

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

Two stunning 17th-century libraries and a cabinet of curiosities.

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

The forgotten mummies of Dakhla oasis.

Scattered monuments in the middle of the Sahara dedicated to the late Egyptian actor and desert explorer.

This eatery is emblematic of the connection between Jamaica and Nubia.

This 7th-century monastery was sacked by Saladin.

A hyper-remote desert cave dramatized in "The English Patient."

This North African stone complex is considered to be the oldest astronomical observatory on Earth.

Giant pigeon houses packed into city streets in Egypt.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

The city-sized home palace of one of ancient Egypt's most powerful rulers gives us a rare look into the lives of the epoch's rulers.