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

This historic national park is covered in the stunning ruins of red rock pueblos.

An artificial crater field that trained astronauts for lunar exploration.

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

A Wild West jailhouse that slid down the mountainside.

A spiritual vortex among the red rocks in Sedona.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

In 1967, murder and mayhem disrupted the tranquility along this quiet stretch of Old Route 66.

A museum devoted entirely to the rattlesnakes and snake-related art.

A sculpture of a flying hawk made from colorful car doors.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A 60-room castle constructed by a horse-racing heir.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

The oldest still-operating tavern in the United States was once owned by a pirate.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

One Confederate statue that accurately reflects the ugliness of its subject.

One street divides a single town that stands in two U.S. states.

One of the last active volcanoes on the Eastern seaboard.