An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

A series of playful yellow penguins share a serious message about the environment.

An existential riddle in the world's largest ancient castle.

A mocking tribute to the past and modern leadership of Prague.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

This artificial cave looks like something out of a fairytale.

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

The first museum in the world devoted to sexual gadgetry.

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

Walk through Czech history in Prague's largest graveyard.

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

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

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

A 16th-century artillery fort built to protect England against European invasion.

A 14th century castle built on the seat of a mighty giant.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

The first archaeological site discovered by aerial photography.

This ancient oak tree sheltered accused "witches" in the 17th century.

A hill carving of the legendary dragon that terrorized the village of Bures in the Middle Ages.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.