A hidden art gallery in an abandoned Warsaw fort.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

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

An underground city of salt.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

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.

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

Puppet theater and museum holding a collection of more than 300.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A fascinating insight into daily life in the Eastern Bloc.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Microscopic scenes; some call it novelty, some call it art.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This artificial cave looks like something out of a fairytale.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

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

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