Once living up to its name as the grandest hotel in all of Africa, the Grande Hotel is now home to a community of squatters.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The remains of a sunken military ship wreck visible through clear water.

The only gulag ever to exist in socialist Yugoslavia.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

Resonant stone, that has been played since prehistoric times.

A unique museum dedicated to culture and artistry of carpet weaving.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Mysterious hillside with a continuously burning natural fire.

This striking icon of the disputed Republic of Artsakh caused a stir at a Eurovision Song Contest.

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

A scenic canyon with thick forests and historic ruins.

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

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

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.

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

Art and a pun, all in one.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.