Curious cave that stays a cool 56 degrees all year long.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

A sculpture of a giant man escaping from the depths of the Earth.

This octagonal rotary jail built in 1889 now serves as a visitor's center.

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

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

Destroyed by flood waters, prison now serves as a training ground for armed forces.

European castle ruins in an American state park are actually the product of death and grief.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Just a man taking his prehistoric pet for a stroll.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

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

A fitting attraction for the corn capital of the world.

The site where Michigan launched its first rocket into space lies abandoned in the dense woods along Lake Superior.

Erosion and time have created a naturally-formed water park.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.