Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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

A self-built castle made by a mysterious man.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Rippling sand dunes frozen in the Arizona rock.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

At 238 feet above the bottom of a gorge this span is known as the biggest thrill on the road to McCarthy.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

The ruins of this Alaska gold mine form a gorgeous ghost town.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Gorgeous cave resemble a winter wonderland.

The ghostly remains of what was once the world's richest copper mine.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

The king of U.S. high points towers over every other peak on the continent.

This whimsical stacked cabin looks like something out of a children's book.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This ghost town houses the remains of Alabama's old state capital.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

Famous for its bio-luminescent inhabitants, known as "dismalites."

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.