This unique Seattle structure was designed to be the greenest commercial building on the planet.

An abandoned 19th-century hospital now swirling in ghost stories.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

The century-old remains of an abandoned farm town in eastern Washington.

An allegedly haunted mansion with a tragic, tawdry past.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

Former farm staffed by mental patients is now a public park.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Tour the original street level of Port Angeles, buried underground in 1914.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

This medieval village/restaurant perpetually celebrates the year 1376.

A short hike into the mountainside forest reveals a decaying 1890s town.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

This oddity shop contains everything from antique tools to a human skeleton.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A flooded Mexican cave that hides a river beneath the water.