An intricate and amazing house built by architect Karl Junker.

When the rain falls, this drain system turns into a musical instrument.

A striking 12th-century-style castle built on the edge of a cliff.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Ruins of a German Castle on top of a towering stone pillar.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The marshy karst plain has reclaimed this beautiful 17th-century church.

A stunning medieval castle houses this eclectic, interactive tribute to all things wine.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

Claude Monet immortalized this medieval bridge in two of his paintings.

For hundreds of years, this huge figure has been blessing visitors before they explore his body.

This ancient walled garden turns fog into food.

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

This Torino museum honors a soldier who kept the city safe using barrels of exploding gunpowder, losing his life in the process.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

The sunlight passing through the opening of this huge cave system creates a magical effect.

A 2,000-year-old engineering wonder hides beneath an Italian town.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.