The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

The biggest solar telescope in the world helps reveal the secrets of our sun.

The eroded core of an ancient volcano is now accessible by a short hike.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A self-built castle made by a mysterious man.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

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