This ancient settlement contains some of the largest earthen mounds in North America.

The remains of a enormous earthen figure of unknown origins cuts across a rural Wisconsin road.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

Booker T. Washington's home at the Tuskegee Institute was a gem of splendor.

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

A collection of huge Pre-Colombian structures in Alabama.

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

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

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

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

This two-room shotgun shack in Tupelo is the birthplace of a King.

This university research project is the U.S. government's weed dealer.

William Faulkner kept his beloved estate wild and untamed.

A celebration of the animation wizard's childhood home and antique railroad memorabilia collection.

Home with Gothic windows featured in a famous painting.

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A remote hill on a stretch of country road where the laws of physics are defied... or so it seems.