The eroded core of an ancient volcano is now accessible by a short hike.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

A stealthy Apache hideaway that became the haunting site of a mass grave.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

A replica of the flagpole that gave a frontier town its name.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

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

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

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

Don't blink or you'll miss it.

A tribute to the statues of Easter Island along Route 66.

The remains of a boarding school designed to forcibly assimilate Native American children.

One of the largest, oldest, darkest, quietest motel rooms in the world.

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

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

This small town was built around a marble quarry and named after one of the most famous sources of marble in the world.

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

A brothel nestled amongst ghost towns, with an abandoned plane wreck to greet you.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.