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

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

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

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

The highest point in South Carolina was once owned by an energy company that neglected it but now the state is taking it back.

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

All that's left of the quintessential "cabin in the woods."

One of the last active volcanoes on the Eastern seaboard.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

The world's largest fire hydrant is supposedly tornado-proof.

A rapidly disappearing authentic bit of the old south.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The world's largest fully steerable radio telescope.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

These eerie outliers of the lightning bug family glow a mysterious blue color.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.

A memorial in coal country commemorates the victims of an all-too-preventable mining disaster.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.