Enormous lake at the bottom of a unique cave system.

The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Before TV meteorologists, there were weather kiosks. This may be the last one in the United States.

Stroll around the headstones of notable figures from Knoxville's history, as well as towering monoliths and melancholic headstones.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

Once a gas station, this flightless airplane beside the Old Dixie Highway now houses a barbershop.

One of few surviving standpipe water towers in the U.S.

A frog crossed this road, but whether it made it to the other side remains a mystery.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

One of the world's earliest skyscrapers.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol. 

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.