Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

It would take 35 firetrucks to fill this enormous glacial pothole.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

A local prank turned town icon.