The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

This historic national park is covered in the stunning ruins of red rock pueblos.

The Magical World of George Phar Legler.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A reproduction of earth's many biomes.

A self-built castle made by a mysterious man.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Rippling sand dunes frozen in the Arizona rock.

A miniature city built by a single hunchbacked monk.

This 1,500-acre development hopes to be the Central Park of the South.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

The former home of the hard partying literary power couple is now one of the only museums devoted to their story.

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

This 12-foot-tall T-rex is the largest K’Nex skeleton sculpture in the world.

148 feet long and in the middle of a verdant forest.

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

Enormous lake at the bottom of a unique cave system.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.