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

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

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

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

Miniature art that tells an enormous story.

Limestone caves with spectacular showcase chambers.

A spiritual vortex among the red rocks in Sedona.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

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

An homage to everyone's favorite prehistoric cartoon family.

A reproduction of earth's many biomes.

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

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

A self-built castle made by a mysterious man.

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