This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This spectacular track has run continuously since 1882.

This giant temperature attraction created some giant electric bills.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

Legends surround this jagged rock formation in the New Mexico desert.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

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.

One of the largest open-pit copper mining operations in the entire country.

Don't blink or you'll miss it.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A motel dedicated to Southwestern nostalgia.

A self-built castle made by a mysterious man.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

This memorial includes fragments from one of the greatest tragedies in United States history.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A museum and tribute to a brave profession.

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

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

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