Mile-long cave system near Great Smoky Mountains.

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

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

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

Resonating tubes make music from highway overpass.

The summit Roosevelt conquered before he descended to become The Chief.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

This jail which was in service for over a century is now open for curious visitors.

Abandoned rock quarry now a haven for mountain bikers and hikers.

In which a local geological marvel becomes a quaint roadside attraction.

A forest wonderland caused by Burlington, Vermont's aggressive southwestern winds.

This throwback amusement park is home to rides and unique storybook figures from the past.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A toxic ghost town sitting atop a massive coal fire.

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

Books you don’t need in a place you can’t find.

Small shop offering mail-order rare and exotic plants.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

Over fifty whirling pools left by the glacial age.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.