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

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

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

A replica of where the Last Supper was held.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

A Christian-themed amusement park and complex rocked by scandals.

An unfinished rail tunnel that has since been used to house cheese and bats.

A historic blockhouse and trading post give a glimpse into the early colonial history of South Carolina.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

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

Asheville, North Carolina, was the the second place in the world to enjoy Kentucky Fried Chicken's secret recipe.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

A wedding chapel, vintage clothing shop, and bar all under one roof.

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

This stunning home looks like it belongs in medieval Europe, not North Carolina.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

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

Follow the path behind this treat-slinging camper van to a sculpture garden in the forest.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

This maze-like slot canyon is a unique gem within an already fascinating geological area.