European castle ruins in an American state park are actually the product of death and grief.

Live long and prosper in Tennessee.

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

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

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

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

Mile-long cave system near Great Smoky Mountains.

More than five miles of underground passageways.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

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

Visit this playground of waterfalls, caves and sinkholes.

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This replica of the Greek structure is in the heart of Nashville.

Elvis's own personal tropical hideaway.

The 19th-century ruins hide deep in an overgrown forest.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Thousands of small machines line the shelves of this personal collection which definitely delivers on its name.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.