A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

A little-known hot spring haven right below the highway.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

The world's largest squirrel statue clutches a pecan bigger than your head.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The world's largest military aircraft cemetery.

A private collection of massive steel monsters guarding a Texas pipe works.

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

The ruins of the castle that chemicals built.

A (slightly) grownup take on the classic retro arcade.

A fake town founded by Western movie stars is now becoming a hip desert community.

The illuminated falls are a gem in North Cascades National Park.

Turnip-shaped island just off the Michigan shore in Lake Huron.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

Come for the speed, leave in love with the desert.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

Miniature art that tells an enormous story.

A common entry point to the Griffith Observatory trail holds its own wonders.

The liveliest ghost town in the state.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.