This sign designates the road that leads to the infamous Area 51.

The self-proclaimed gateway to the Extraterrestrial Highway.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

A land of debatable treasure.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

Dramatic river bend surrounds a natural red-rocked pedestal.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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.

America's only nuclear missile silo open to the public.

A reproduction of earth's many biomes.

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

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

An urban laboratory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

These free-roaming horses were once destined to disappear from the land.

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