A little-known castle set in a nature reserve.

A subterranean playground in an abandoned slate mine.

One of the few surviving street funiculars in the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The modern birthplace of Irish freedom.

Northern Ireland's Brobdingnagian stepping stones.

The oldest inn in England served brew to the crusaders.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Monasteries on rock pillars, once accessible only by frayed ropes.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A small statue of child Jesus given by Magellan in 1521

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Three bridges straddle a stream, one stacked upon the other.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The remains of centuries of copper mining appear like an alien landscape.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

This holy site either displays a centuries-old cross or a complete fake.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.