This platform is now a memorial dedicated to those who were deported during the Holocaust.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Berlin's old airport.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

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

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

Abandoned since 1998, this train station has become an oasis for urban explorers.

A beautiful maze marks where three countries meet.

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

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

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.