An experimental, automotive replica of Stonehenge.

The oldest extant wooden jail in South Dakota and possibly the United States. 

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This towering wooden Sasquatch was carved with a chainsaw.

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

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

The first declared National Monument in the United States.

Just a man taking his prehistoric pet for a stroll.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

A town honors its legacy of traditional American Indian pipe carving with one gigantic pipe.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

One of two giant blue cockerel statues erected with an intentional double meaning.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

This sculpture of a bowler hat is complemented by a matching umbrella a few blocks away.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

A symbol of Texas pride.

High-end dining has a home in this former gas station.