The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The unexpectedly beloved remnants of a controversial thermal power plant.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

America's oldest Italian restaurant is a San Francisco institution.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Volkswagen's dedicated museum dives into the complex history of one of the world's best known cars.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The Grand Canyon’s original airport, which once welcomed pilots like Amelia Earhart and Charles Lindbergh, lies abandoned.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

The U.S. military dumped millions dollars worth of goods off a beach in Vanuatu, purely to spite the British and French.

Captured in 1968, the Cold War spy ship is the only U.S. Navy vessel being held by a foreign government.

A bizarre collection of gifts to North Korean dictator Kim Jong Il from the despots of the world.

Only ruined buildings and abandoned charcoal kilns remain of this once bustling Wild West boom town.

10,000 flowered plants bloom in the City of Roses.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

Eulogizing an unknown man's unusual demise.