A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

This historic national park is covered in the stunning ruins of red rock pueblos.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

An off-the-beaten path cave with an underground lake.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

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

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

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This abandoned horse racing track was an exercise in hubris from its inception.

A self-built castle made by a mysterious man.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

An open-air, roadside eatery celebrating a historic indigenous cuisine of complicated significance.

A former department store turned into a quirky restaurant.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

If you ever wanted to own an actual piece of Disney World, this is the place to shop.

A historical landmark that has been a central hub of entertainment since 1928.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

This massive vault of comedic history is no joke.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.