This massive subterranean fissure is known as the "underground Grand Canyon."

This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

A pair of connected skyscrapers form this symbolic gateway.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The "Mother Temple of the Pacific Islands" stands at the center of 20 acres of lush, tropical prayer gardens.

A site of natural wonder and flying coconuts in Samoa.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

This once-derelict building is now one of the most beautiful bookstores in the world.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The building is a gigantic piece of art inspired by the shape of a desert rose.

Qatar's oldest market can trace its origins back more than a century.

Home of the infamous Rug Man of Doha.

The world's oldest bookshop still in operation.