Book excerpt: Traveling Glacier National Park's Going to the Sun Road is an experience like no other. Laborers toiled for nearly 20 years to complete the 50-mile road that winds an impossible route through the heart of Glacier. One of the most scenic highways in the world, this marvel of engineering set the standard for all national parks. C. W. Guthrie tells the intriguing tale of the history and the construction of the epic Going-to-the-Sun Road. 60 color and black-and-white photographs.