One of the few surviving "Wigwam"-themed motels.

The world's longest known cave system.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This Renaissance square was at the center of Leonardo da Vinci's map, the first ichnographic ever.

The deepest metro station in the world.

When you've got to go, you've got to go.

340-foot statue built to honour the Heroes of the Soviet Union.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

Spanning over 10,000 square miles, this ancient salt pan is one of the largest on the planet.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

Road signs in Namibia mark the location of one of the five major circles of latitude.

The remains of diamond fever taken over by the desert.

Why walk on this historical site when you can zoom down instead?

The most famous location in China was home to whole dynasties worth of imperial rulers.

The hallucinogenic center of the ancient world.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

Legend says this sacred tree was a gift from goddess Athena.

A sharp sculpture made of thousands of pieces of jagged glass.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.