One of the ghostly stops along Route 66.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

The site of murders and Satanic cult gatherings.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

An inconspicuous footbridge beloved by San Diego locals.

A sculptor's dream castle turned fantastical ruin.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

The remains of a ruined mansion memorialize the 1906 earthquake.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

The beauty of urban decay, hiding some dark secrets.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A meditative space out of a fantasy story.

A popular swimming hole that hides one of America's most deadly diving spots.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

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

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

A ghost town at the airport is now a refuge for blue butterflies.