Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

A massive, abstract lookout tower providing a panoramic view of Prague.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Monument to a suicide protesting the Soviet invasion.

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

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

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

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

Macabre astrological automaton clock dating to the late 1400s.

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

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A 12th-century Italian skirmish gets reenacted with 500,000 pounds of flying citrus.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

A tree that defies gravity grows in an ancient ruin.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

A cherry tree growing atop a mulberry tree.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

An eccentric home in Sicily turns heads on a regular basis.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

A map of Italy made entirely of trees.

A beautiful discovery site of prehistoric burials.