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

Stairs often replace streets on the steep slopes of this old mining town.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

The former home of the army detachment that captured Geronimo.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

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.

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

The "Father of Arizona" tried to build a Zoroastrian fire temple on the hill where he's now buried.

Limestone caves with spectacular showcase chambers.

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

Take a monster truck tour around an ostrich farm in the middle of the desert.

This giant steer-skull edifice refuses to die.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

An off-the-beaten path cave with an underground lake.

A reproduction of earth's many biomes.

Legend says train robbers stashed their gold within the depths of this unusual cave.

America's only nuclear missile silo open to the public.

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

Miniature art that tells an enormous story.

A statue honoring 44 continuous years of greeting passing ships.

This kitschy tavern is also home to rare early editions of "Treasure Island."

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.