A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A former squatter's paradise outside Prague.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

This spooky statue sits outside a famous Prague theater.

Macabre astrological automaton clock dating to the late 1400s.

The first museum in the world devoted to sexual gadgetry.

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

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

A surreal statue honoring Prague's favorite literary son.

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

A Baroque mansion with ties to legendary magicians and alchemists.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

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

A modern-day Lascaux cave underneath Paris.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A surrealist timepiece by the artist of melting clocks.

A museum of magic with a Sadist past.

A 17th-century doorway in a small Sabine village is a portal into the mysteries of alchemy.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A huge enchanting public park just outside the ancient walls of Rome.

A Nesting Doll of Churches.