In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

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

The largest self-built castle in the U.S., six decades in the making.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The first declared National Monument in the United States.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Just a man taking his prehistoric pet for a stroll.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

This erect, phallic geological spire wasn't always named so domestically.

A Winnebago Tribe collection featuring arrowheads, artwork, and a mysterious rock carving.

An Englishman loses his scalp to a Cheyenne warrior and lives to donate it to a library.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

A detached cement mixer has been transformed to resemble a relic from some obscure NASA mission to Oklahoma.

A hot dog stand where the heads are just as hot as the dogs.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

The remnants of an early American attempt at missile defense.

The largest land animal skull ever discovered.

This historic folk art garden contains a nightmare tower that claims to be the world's largest concrete totem pole.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

A UFO scrapyard in the California desert.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.