Inside this Krakow church, an explosion of psychedelic color.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Real bones which are said to have belonged to a Polish dragon.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

This grubby wall is said to be one of the Earth's esoteric energy centers.

This winding road through an Italian canyon may be the most scenic drive in the world.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

This skewed English house has looked like it's going to fall over for centuries.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A subterranean playground in an abandoned slate mine.

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

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Roman ruins top white travertine terraces formed by ancient hot springs.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

A century-old tradition has culminated in a small but singular collection of feline effigies.

A Reformation-era fiery figurehead once denoted this location as a print shop.

This network of narrow, medieval passages has the most delightful name.

The remains of an ancient bathhouse sit inside this aptly-named pub.