The fleeting glimmer of fireflies. The bugle of wild elk. The graceful flight of a blue heron as it skims the surface of a scenic river. Each of these is a testament to the resurrection of a vast wilderness once blighted by industrialization. The Pennsylvania Wilds, or “the Wilds” for short, is an unspoiled region in northwestern Pennsylvania. Its 2.1 million acres of public lands encompass 50 state game lands, 29 state parks, eight state forests, and two “wild and scenic” rivers. A century ago, the logging industry cleared the forests of their trees and strip mines gouged the earth in search of coal, but today these lush mountain valleys and pristine woodlands offer safe haven for wildlife and endless opportunities for outdoor adventure. So grab your binoculars and your hiking boots and check out these activities at five top places to visit in the Pennsylvania Wilds.