Each year thousands of drivers travel Washington State's breathtakingly beautiful North Cascades Highway (State Route 20), observing the region's alpine flora and fauna and its dramatic geologic features. The North Cascades Highway, an illustrated natural history guide, helps travelers and readers to appreciate the deeper beauty behind the landscape.

Organized as a series of stops at eye-catching sites along eighty miles of the highway, The North Cascades Highway reveals the geological story of each location. Plate tectonics, rock formation, erosion, and glaciation are...