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

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The shortest river in America flows for just 201 feet.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

The only road through the heart of Glacier National Park.

This amazingly preserved Gold Rush town is a historian's dream.

Supposedly Satanic numbers adorn this preserved submarine sail.

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

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

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

Home to the deepest rift anywhere on Earth.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

The palatial McDonald's that inspired Wesley Willis.

The study has wall paneling from a 17th century ship.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).