The third title in the Acadia National Park guide series, Acadia's Carriage Roads covers the history, geology, and biology of the area. It includes practical advice and maps to help visitors get the most from their tours of the roads, whether on foot, by bicycle, or on cross-country skis. With their work-of-art stone bridges, these crushed-rock carriage roads — the result of decades of effort by philanthropist John D. Rockefeller Jr. — are known throughout the world for their beauty.