A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Hiding the longest subterranean river known in the world.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Lavish royal estate punctuated with heated greenhouses.

At this exhibit on the world of poison, venomous animals steal the show.

The Suurhusen church tower in Germany leans over farther than the famous Leaning Tower of Pisa.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

A meteorite-bounded town in Bavaria.

This 600-year-old home seems to defy physics.

This former steel and coal plant is now a neon-lit industrial fantasia.

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

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

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

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

This "floating railway" is one of the world's oldest monorail systems.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

An intricate and amazing house built by architect Karl Junker.

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

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Thousands of coffin-like pillars make up this controversial Holocaust memorial.