This spectacular track has run continuously since 1882.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This popular pitstop lives up to its name.

A frozen oasis lies beneath the scorching New Mexico desert.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

A monument commemorating how a frontier town got its unusual name.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

This Old West prison built into the side of a cliff was said to be inescapable.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

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

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

This church on a Tohono O'Odham reservation has stood since 1797.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Miniature art that tells an enormous story.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

Visitors to this public park will also find the ruins of an old western fort.

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.

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

A reproduction of earth's many biomes.

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

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

This once-booming Gold Rush town is now home to a herd of feral donkeys.