When ecosystems collide in the arid Southwest.

The largest island on the great salt lake is home to curious creatures and strange stories.

Jurassic Park—A Still Life.

A miraculous natural phenomenon known as "the spring that breathes."

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.

This town is home to the world’s largest arch constructed entirely of elk antlers.

This rustic old building is said to be the most photographed barn in America.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

Home to a timed geyser created by complete accident.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

An entire town preserved as a historic landmark.

Boise State's stadium was the first non-green football field in the world.

Jail from the 19th century that was built by inmates.

Home to the deepest rift anywhere on Earth.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

The notorious Wild West outlaw was raised in this unassuming abode.

A tunnel with windows, so you don't miss out on the impressive views.

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.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.