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

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Even in death, he's still your huckleberry.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

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

The largest source of fossilized insects anywhere.

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.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

Deadly airliner crash preserved for those willing to climb and pay respects.

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

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

Home of the International Space Hall of Fame.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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

A spring-fed pool so deep it's used for scuba diving as well as swimming.

The only diamond mine in the world where you can keep what you find.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

The Grand Canyon of Texas.

The only international border marker within the United States.