Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This black church sits alone among a field of lava rock.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

A historic presidential getaway on the continental United States' southernmost island.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

The legend associated with these ruins understates the splendor of the mansion that once stood here.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

The Guardian of Tallinn.

This Stockholm light tower can be controlled by anyone with a smartphone.

This massive, ancient stone was disassembled and then put back together again.