A unique geological area spiked with wind-carved rocks that resemble teepees.

"I did this all while you were watching TV."

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

This is one really big nut.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

Thousands of well-dressed mummies below a monastery.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

The longest spit in the United States ends at a lighthouse in the Strait of Juan de Fuca.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

An impressive waterfall nestled in the cliffs of Idaho's Snake River Canyon.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

This grove of ghostly cedars was killed in 1700 by an enormous tsunami, felt from the United States to Japan.