Macabre astrological automaton clock dating to the late 1400s.

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

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

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

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

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

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

An alien church provides much needed silence in the midst of a Finland shopping center.

This fantastical icy castle is built anew every winter.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

A subterranean house of worship carved right out of the bedrock.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Rising from the sea like a stone monster.