A Nazi concentration camp and Anne Frank's place of death.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

It's always summer at the beach inside this former airship hangar.

No need to strap in for a "ride" on this walkable roller coaster.

The prototype for all Nazi concentration camps.

A small but immensely extravagant palace built by the "Night King."

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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

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

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

A slice of central Asia in the middle of Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

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

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

To fit bodies into this Renaissance crypt, they were first left to decompose in the crypt's rotting room.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

Whimsical sculptures and caves chiseled by nature over the millennia.

Peek into a cave of giant, glimmering crystals.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.