This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

An industrial relic is now one of Europe's most staggering art spaces.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

Tucked away in a small German apartment is an eclectic museum devoted to West African vodun culture.

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

The monumental home of Prussia’s eccentric "Cannon King."

A medieval gate once used as a prison and how home to a city museum.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

If the tunes of antique organs and musical marionettes don't intoxicate you, the draft beer certainly will.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

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

A poignant mural honors the heroic teenage non-conformists who took on the Nazis and paid the ultimate price.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

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

A varied collection of brains in alcohol.

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

This painted Lego bridge is the product of over a century of locomotive history.

This highrise residential building looks mundane, but hides a water tower and WWII bunker.

A beautiful maze marks where three countries meet.

A former customs station on the border of Germany and the Netherlands.