North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

More than five miles of underground passageways.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

An enormous natural sandstone bridge in Kentucky.

Twice a year, this road is closed off to allow for the migration of thousands of snakes, reptiles and amphibians between cliffs and a swamp.

The famous Beatle secretly visited this Illinois town several times to visit his sister.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

The world's longest known cave system.

A whimsical folk art garden full of punny pieces and a diorama containing 3,500 toys.

A 70-foot replica of the famed Eiffel Tower.

This 16-foot-diameter wooden coin has been standing in Iowa City since 2006.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

Over a million artifacts fill this factory-turned-museum that explores the history of American windmill production.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This once rural mansion now sits in the heart of the city.

An idle pastime becomes a record holder in Boys Town, Nebraska.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

A picturesque (all-natural!) beach in a landlocked state.

A beautiful botanical garden in the heart of the Natural State.

A 17-acre urban oasis featuring a pollinator garden, heritage trees, and an aerial tree walk.

A 200-year-old live oak on the banks of Lake Pontchartrain.

Some believe this tree to be more than 1,500 years old.

A famous—but endangered—plant is on view at an unassuming nature preserve a quick drive from Myrtle Beach.

A carnivorous plant paradise in a serpentine bog.