The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Erosion and time have created a naturally-formed water park.

Continuing the tradition of the dime museum in style.

An emerald-green grotto just a short trip from Austin.

The world's first commercial spaceport is a disappointment of cosmic proportions.

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.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

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."

Legends surround this jagged rock formation in the New Mexico desert.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

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

A museum dedicated to the alleged Roswell Incident.

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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The biggest solar telescope in the world helps reveal the secrets of our sun.

This golf ball–shaped former desert real estate office now houses a UFO museum.

The world's largest military aircraft cemetery.

Limestone caves with spectacular showcase chambers.

An urban laboratory.

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

See massive fossils that are over 200 million years old in northeastern Arizona.