This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This structure among the trees was the result of divine inspiration.

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

This abandoned nuclear cooling tower casts a shadow over a bucolic town.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

The world's largest collection of porcelain "veilleuses-theiere," or night light teapots, includes four that belonged to Napoleon.

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

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

This defunct, fortress-like prison has been the setting for several movies.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

This historic train station has been converted to a locomotive themed hotel.

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

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

Live long and prosper in Tennessee.

The first full-scale tunnel built in America is short but scenic.

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

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

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

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

Enormous lake at the bottom of a unique cave system.

Home of an evil witch famous within southern folklore.

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