The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

A mountaintop space observatory that is certified dark.

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

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

Mile-long cave system near Great Smoky Mountains.

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

Live long and prosper in Tennessee.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

Enormous lake at the bottom of a unique cave system.

Home of an evil witch famous within southern folklore.

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

All that's left of the quintessential "cabin in the woods."

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