Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

Outsider art meets paleontology at this roadside reptile repository.

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

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

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

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This abandoned amusement park was built on a site with a dark history.

A miniature golf course crafted inside the world's largest simulated cave.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.