These free-roaming horses were once destined to disappear from the land.

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

An artificial crater field that trained astronauts for lunar exploration.

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

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

What is the Thing?

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

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

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

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

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

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

Limestone caves with spectacular showcase chambers.

Ancient pueblos built into the base of a natural canyon wall.

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

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Eons ago, a rushing lava river formed this pristine passage through solid rock.