A plaque installed underwater marks the fall of a royal family from an imagined parallel universe—part of a globe-spanning art project.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

An Orthodox church inside a small "Garden of Eden" built by a man who had a vision.

German-style coffee and cake, just like Oma used to make it.

A serious museum dedicated to two German comedians.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

This Scottish bridge seems to compel dogs to leap to their death.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

These mysterious mazes carved on the rock may be up to 4,000 years old.

The site where the leader of the Kosovo Liberation Army was killed is now a memorial.

A futuristic, brutalist masterpiece that is also strangely prison-like.

This stone figurine was made more than 6,000 years ago and depicts a female deity of the Neolithic Vinča culture.

The medieval legend behind this holy well was one of the inspirations behind "Alice's Adventures in Wonderland."

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

A mysterious monument where a woman who records say never existed was burnt alive for being a witch.

A scattered trail of street art adds a pop of color to the city's stark structures.

A secret door leads to this cozy dive that sells only “milk.”

The final resting place of soldiers' loyal canine companions.