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

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

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

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Unusual rock formations eroded into a landscape of stone beasts.

A historic covered bridge, only one of two remaining in North Carolina.

A fantastic castle rumored to be the birthplace of King Arthur.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The Origin of On the Origin of Species.

Repository for more than 22 million pickled specimens.