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An ancient Viking village in North America that predates Columbus by 500 years.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

An inconspicuous footbridge beloved by San Diego locals.

An ode to the friendship between four Pacific Rim countries.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

One of the American Southwest's most extensive collections of Navajo rock art.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

Sloth rehabilitation center in the jungle of Costa Rica.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Disused penal colony features prisoner artwork, some sketched in human blood.