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

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

An abandoned town is hidden in Great Smoky Mountains National Park.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

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

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

Mile-long cave system near Great Smoky Mountains.

Enormous lake at the bottom of a unique cave system.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The humble field where the first Major League Baseball game was played.

The last street in Pittsburgh that's paved with wood.

This secluded walking trail is a hidden gem of a Pittsburgh park.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.