This cave holds a surprisingly colorful variety of geological oddities.

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

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

A walk through the historic city center, under the streets of Seattle.

This historic graveyard was partially paved over to create a streetcar line.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The world's largest rotating world.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

Its unique collection details the history of the state's svelte railroads.

The world's only and thus largest collection of its kind celebrates everyday wonder through simple umbrella sheaths.

Explore the dark underground corridors of this graffiti-covered former military fortification.

This Art Deco theater is the last remaining opera house in the “little Broadway of the North.”

Maine’s only official memorial to the Underground Railroad.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

The eccentric mansion of one the most popular horror authors of modern times.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

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

The rest of him lived another 61 years and was buried elsewhere.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

A sliver of nostalgia in Seattle's Viretta Park.

This painted blacktop brings the classic arcade game to life.