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

Macabre astrological automaton clock dating to the late 1400s.

This doorless 20th-century elevator doesn't stop or slow down.

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

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

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

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

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The topiary maze at the Habsburg hunting lodge.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

A striking 12th-century-style castle built on the edge of a cliff.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.

A kaleidoscopic warehouse-maze of handmade neon signs.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.