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

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

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

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

A memorial to the beloved brown bear that served in the Polish army during World War II.

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

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

Amidst towering office buildings, a local pub lives inside Sheffield’s oldest surviving domestic building.

A tribute to the women who quietly kept the local steelworks alive during both world wars.

This magnificent mural was created with over 30,000 colored bricks.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

The bizarre headgear looks like it was made for a fool, not a king.

This tribute to a beloved cricket umpire is a magnet for risqué pranksters.

These medieval monastery ruins are surprisingly overlooked by most tourists.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Pompeii's less famous neighbor is still revealing her secrets.