More than 21,000 images fill this overlooked gem of a prehistoric site.

A warm desert spring holds one of the rarest species on earth.

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

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.

One of the American Southwest's most extensive collections of Navajo rock art.

This popular pilgrimage site offers a hole filled with holy healing dirt.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

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

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

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

This is one really big nut.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

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

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

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

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

A cave's rare beauty held a cavernous secret hidden underground.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

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

These aggressively sustainable art homes look like something out of 1970's science fiction.