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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

A striking 12th-century-style castle built on the edge of a cliff.

Where once there was a train station bathroom, there is now this German burger joint.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Ruins of a German Castle on top of a towering stone pillar.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This remote Moravian mission brought Christianity—as well as devastation—to the Inuit people.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

Dine like an American revolutionary at Colonial Williamsburg.

A ghost town in a remote corner of Oregon hosts a touching tribute to Sacagawea’s son.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

The former home of the famed revolutionary Pancho Villa is now a museum in his honor.

This museum houses a large collection of old motorcycles.

These pillars are one of the few remnants from the mysterious lost empire of Makuria.