A coal fire has been burning underground here since 1896.

This interpretive path lets you get up close and personal with dinosaur bones.

The fifth-longest natural arch in the world, and the longest outside China.

Contains a wealth of information about the first exploration and later use of the Green and Colorado Rivers.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

A diorama lover's dream world.

A Dutch museum preserves the world's most diverse collection of vertical slices of soil.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

Tasked with beautifying a disused stretch of industrial land one artist filled a hole with grass.

The gravestones in this lost burial ground were bulldozed and replaced with houses and a dog park.

Inside this curiosity shop, visitors can peruse the clown collection or purchase a molar from the mouth of Bigfoot.

This park celebrates a sister city relationship that survived the Cold War.

Touching displays of wishes for peace from the Cold War era.

This statue and its surrounding plaques tells the story of Ko-kwal-alwoot and the kinship between the Samish people and the sea.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A geological mystery on Camelback Mountain.

An out-of-the-way state park in Oregon that features both a picturesque waterfall and the ruins of a hydropower plant.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Furniture tries to escape an abandoned building in San Francisco.

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

This former INS center is now home to a thriving community of artists, from performers to painters to architects.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.