Cages that once displayed the bodies of executed leaders hang from a German church tower.

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

This 19th-century fountain features sculptures of little gnomes that help with chores.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The tallest mountain in mainland Netherlands isn't actually very tall.

A beautiful maze marks where three countries meet.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This historical Netherlands fortress still bears the marks of its single siege.

A luxury hotel housed in a former 15th century Gothic church.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Incredible labyrinth of man made caves.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

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

This abandoned Belgian fortress is purposefully being left to nature.

Cemetery honors Americans who died during WWII and is the resting place of Gen. George S. Patton.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

The final resting place of one of Germany's most accomplished Renaissance men.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Burgers and fries in the shadow of a dreaded Nazi symbol.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The prototype for all Nazi concentration camps.