Enormous lake at the bottom of a unique cave system.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

An ode to "The Queen of Appalachia."

One man’s religious convictions led him to build this stone castle meant to withstand an apocalypse.

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.

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

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

Inside the Wayne County airport is an amazing collection of lights and sounds.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Advice-columnist's bell tower, paid for with pennies.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

This museum was once the home of industry titan Matilda Dodge Wilson.

What was once the largest NFL stadium.