One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

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

The scuba diving training facility was named for the steam that rises from the cave's chimney.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Quite simply the largest tree in the world (by volume).

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Stroll through a wonderland of stupendous moss-covered trees.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

This striking art museum holds an amazing series of curiosity cabinets.

This cave holds a surprisingly colorful variety of geological oddities.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

The world's longest known cave system.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This replica of the Greek structure is in the heart of Nashville.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.