Steep canyon walls hide a forested oasis in the West Texas desert.

Bits and pieces from the ill-fated Donner Party's winter cabins.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The world's largest dead polar bear, immortalized by taxidermy and Hunter S. Thompson.

Home of the International Space Hall of Fame.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Legends surround this jagged rock formation in the New Mexico desert.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

A sleepy little town that had the greatest landslide in North American history fall on it.

Thousands of glyphs created by an unknown culture decorate the rock formations of this canyon.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This little-used trail winds through the highest mountain range in central Nevada with sections around 10,000 feet.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

The only road through the heart of Glacier National Park.

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

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Over 600 acres of idyllic open grassland honor Nebraska’s georgic storyteller.

Home to the deepest rift anywhere on Earth.

The site of a minor battle might have been forgotten if not for one participant’s famous family and the death of a respected warrior.