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

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Hungarian mummies in beautiful painted coffins.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Museum dedicated to the terror regimes of Hungary.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A unique, free-floating electric ferry may be the only of its kind in Europe.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

This German "living museum" is maybe a bit too immersive.

The largest brick bridge in the world.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

There are two dozen tanks just sitting in an open field in Lower Saxony.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This East German military command bunker was ready for World War III.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

A Nazi concentration camp and Anne Frank's place of death.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.