A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

European castle ruins in an American state park are actually the product of death and grief.

A fake mine that was made using real mining techniques which is also used as a community center.

The boulder is a landmark, public art, and an icon.

A museum dedicated to the mysterious cryptid.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A crumbling cliffside ruin hidden in the woods.

On the Oregon coast is a natural hole that seems to be draining the sea.

Only known mainland rookery of the threatened Stellar sea lion.

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

Leave a button on the jacket of this iconic Seattle clown.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

A beautiful final resting place for some of the noteworthy deceased.

This working class sculpture pounds his hammer all the livelong day.

This former coal gasification plant found a curious second life as a popular public park.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.

Locals transformed this Canadian evergreen into a secret hangout with spectacular views of Vancouver's skyline.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

A giant Troll lurks under one of Seattle's oldest bridges.