The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

A part of the world's largest marsh seems to be growing bright red Martian grass.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This natural "sea of stones" was once used by the Romans as a quarry.

The only remaining U-boat that is still floating never actually saw any action in World War II.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A subterranean display of public art and architecture.

The "Prussian Versailles" that is as glorious today as when it was built.

These 18th century gardens tell a rocky story of the son of Odysseus.

An intricate and amazing house built by architect Karl Junker.

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.

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

When German-Iraqi relations broke down, this embassy was vacated post haste.

Living trees form the structure of an open-air palace.

A fascinating insight into daily life in the Eastern Bloc.

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.

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.