The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

The final resting place of the living embodiment of the famous Forest Service symbol.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

See massive fossils that are over 200 million years old in northeastern Arizona.

Jail from the 19th century that was built by inmates.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

Supposedly Satanic numbers adorn this preserved submarine sail.

Home to the deepest rift anywhere on Earth.

The wooden airship was the largest flying boat ever built.

Home of Howard Hughes' Spruce Goose.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Roaming bison and a spectacular view at the highest point in Nebraska.

The same security that protects our nukes accidentally protected a gentle herd of antelope.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

The notorious Wild West outlaw was raised in this unassuming abode.

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

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.