This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A beautiful geyser under environmental threat.

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

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.