An enormous natural sandstone bridge in Kentucky.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Prehistoric animals decorate this popular outdoor park.

Moonbows over Kentucky.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The world's longest known cave system.

This Tennessee manse was built so opulent that the very utilities doomed it to fail.

This structure among the trees was the result of divine inspiration.

The longest-serving U.S. Secretary of State and Nobel Peace Prize winner was born in this humble cabin.

The pan man stands as a testament to the functionality of American cast iron cookware.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

Alongside this Memphis trail are several sculptures that show trail-goers how to relax.

For decades these polar bears have roamed all around a Nashville neighborhood.

The site of the Scopes Trial contains a small exhibit dedicated to the famous case.

An attack on a prominent Black attorney's house sparked a watershed moment in Nashville's civil rights movement.

An homage to the pointers and retrievers that have long been a hunter's best friend.

John Hendrix predicted the creation of the "Secret City" built as part of the Manhattan Project.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

Ethereal alien hums and haunting whale songs emitting from...a giant sheet of vibrating metal?

This improbable contraption was passed down through five generations of industrious Tennesseans.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

This limestone outcropping was once a ceremonial site for ancient Native Americans.