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

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Reproductions of nine banned oil paintings coyly hidden behind a curtain in a New Mexico conference room.

More than 21,000 images fill this overlooked gem of a prehistoric site.

One of the American Southwest's most extensive collections of Navajo rock art.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

This popular pilgrimage site offers a hole filled with holy healing dirt.

The world's first commercial spaceport is a disappointment of cosmic proportions.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

This abandoned horse racing track was an exercise in hubris from its inception.

Outsider Art Community.

One of the largest private collections of cars manufactured by the short-lived Franklin Automobile Company.

The handsome statue is a tribute to the post riders who traversed 52 miles of tough Arizona terrain.

This comprehensive collection features Native American artifacts dating back centuries.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

The largest and most well-preserved petroglyph site in the Verde Valley.

An important piece of history from mankind's journey to the moon sits in the lobby of a government science lab.

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

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

Arizona's first government hub is a rustic cabin now preserved as part of a historical museum.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

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