A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The true meaning behind this sculpture remains unknown.

Budapest's Communist-era statues, banished to the suburbs.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This building has survived for more than a century and remains virtually untouched.

Hungarian self-built castle.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

The abandoned military base looks like a post-apocalyptic wasteland.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

The final resting place of many of Germany's most famous communists.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

The bridge that cost Germany a World Heritage Site.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

Terrifying derelict military hospital once housed a recuperating Hitler.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A historic fire call point.

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.

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

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.