Limestone caves with spectacular showcase chambers.

Some of Arizona's best spit-roasted tacos al pastor can be found at a weekend swap meet.

Giant telescope mirrors built in a spinning furnace under a college football stadium.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

Contains a wealth of information about the first exploration and later use of the Green and Colorado Rivers.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This former rail stop in Utah was abandoned, repopulated by some nostalgic friends, and now is home to a single DIY aviator who lives in a hangar.

A Mars simulation in the southern Utah desert.

Largest collection of mounted dinosaur specimens in the world.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

A famous flea market artist's studio that's full of odds and ends.

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

The state bird of New Mexico, constructed entirely out of garbage.

The U.S. Air Force has an anti-satellite laser weapon.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

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