The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The longest living non-clonal organisms on Earth.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

One of the oldest living oak trees in the Southeast.

Settled in 1696, abandoned after the Revolutionary War.

4,000 monkeys used for medical testing on an island off of South Carolina.