Enormous lake at the bottom of a unique cave system.

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

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

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

This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

A snapshot of the city's fascinating voodoo culture.

Site of a former hidden treehouse in New Orleans.

New Orleans' famous cemetery, located on the site of a former race track.

One of the world's largest collections of pathological specimens.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's largest bioluminescent area was undiscovered by science until 2005.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.