Enormous lake at the bottom of a unique cave system.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Mile-long cave system near Great Smoky Mountains.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The secret city built by the Manhattan Project.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

This Tennessee manse was built so opulent that the very utilities doomed it to fail.

This stone memorial pays tribute to a massive shipwreck which was sadly overshadowed by the death of John Wilkes Booth.

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