The first declared National Monument in the United States.

A somber monument commemorates the site of a Native American reservation marked by suffering.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

A half-acre utopia in the New Mexico desert features a graveyard, a game of horseshoes, a library, and a mailbox.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

North America's largest accredited model railroad museum.

A black cottonwood gets a second life as a home for books.

Birdhouses, peacocks, animal sculptures, and a graveyard are all found along this eclectic nature trail.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

New Plymouth, Idaho is the only U-shaped town in the United States.

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Natural rock water slides hidden in the remote forests of northern Idaho.

Supposedly Satanic numbers adorn this preserved submarine sail.

An Idaho legend carved out a cave village with his own two hands.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

A few dilapidated structures are all that remain of this deserted former silver mining town.

A wild west land agreement was etched right onto this historic Idaho stone.

Sweet Willy, at 30 feet tall, is the world's biggest beagle.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.