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

A natural history wunderkammer in the middle of the desert.

An artificial crater field that trained astronauts for lunar exploration.

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

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

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

A reproduction of earth's many biomes.

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

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

A Wild West jailhouse that slid down the mountainside.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

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

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.