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

This memorial pyramid marker honors one of the United States Government's first official camel riders.

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

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

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

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

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

The first permanent memorial to a unique secret weapon of World War II.

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

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

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

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

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

A Wild West jailhouse that slid down the mountainside.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

An artificial crater field that trained astronauts for lunar exploration.

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

Don't blink or you'll miss it.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Collection of vintage trailers double as hotel rooms.

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