After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

Sail in for a ’dam good slice.

This basement museum explores the art and artistry of fascism.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

After years of being casually peed on by humans, this tree is peeing back.

The medieval network of canals hidden underneath the city is opened to explorers each year.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

The beautiful baroque library of the Hapsburg empire.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

A hands-off space for graffiti artists to hone and display their skills.