This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

World's first "penitentiary," meant to be humane, drove men insane.

One of the oldest living oak trees in the Southeast.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Largest display of Wesleyana anywhere in the world.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

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

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The world's longest known cave system.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

This replica of the Greek structure is in the heart of Nashville.