One of the few working locomotive roundhouses in the United States.

Most-visited and most-photographed slot canyon in the American Southwest.

A sharp bend in a dramatic river canyon cut through red rocks.

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.

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

The drama of nature in full effect in this Nevada State Park.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Despite its name, this route in southern Utah offers a heavenly day trip.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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

The fifth-longest natural arch in the world, and the longest outside China.

The world's longest known cave system.

Take a drunken tour inside the world's largest known geode.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

This natural wonder is disappearing at an alarming rate.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

It took more than 20 years and a sharp eye for one man to assemble this quirky collection.