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

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

Home to drunken tower-climbing goats... seriously.

A vision of beautiful Hindu architecture in the middle of the American South.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

The beauty of urban decay, hiding some dark secrets.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

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

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

The world's longest known cave system.

Home of an evil witch famous within southern folklore.