The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

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

A natural sandstone bridge hidden in the Sewanee forest.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

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

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

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

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

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

Railroad came. People came. Railroad left. Town died.

Mile-long cave system near Great Smoky Mountains.

The secret city built by the Manhattan Project.

Visit this playground of waterfalls, caves and sinkholes.

Home of an evil witch famous within southern folklore.

Featuring a Loretta Lynn display and a re-created coal mine exhibit.

Wander the locker-lined, terrazzo-floored halls and sleep in a former classroom at this unique inn.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

A ceramic-tiled room at the Seelbach Hotel said to have secret tunnels used by Al Capone and a crowd that helped inspire F. Scott Fitzgerald's 'The Great Gatsby.'

The collection of a paranormal investigator who traveled the country collecting haunted items and stories.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

The water of this well in Toledo lost its sweetness after the death of a young love.

On market days, a tax collector sat in a small cave at the end of this arched bridge.

This set of Berber granary caves is now an interpretation center for the cave window structures in the Clarino valley.

The lasting remains of an airfield used during the Spanish Civil War.