An eerie, decaying ghost town destined to fade into the forest.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Visit this playground of waterfalls, caves and sinkholes.

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

Only intact Ichthyosaur skeleton in the United States.

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

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

The only Florida state park with publicly accessible caves.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

Tucked away down this Baytown alley exists a one-of-a-kind art exhibit of technicolor umbrellas.

Nestled in the heart of a Texas town is a dreamy secret garden dating back to the 1940s.

A swamp and garden tour featuring local wildlife and exotic botanical specimens from around the world.

This creepy, yet oddly beautiful cemetery is home to one of the founding fathers of Lake Charles.

An otherworldly musical haven in The Big Easy.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The crumbling remains of a 19th century fortess.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.