From in-town urban hikes and walks to scenic suburban forays to world-class area wilderness hikes, Washington, D.C. offers great opportunities for nature-lovers. This book guides locals and visitors to the wealth of possibilities here for every season, including a ridgetop trek on Massanutten Mountain, a leisurely walk through Prince William Forest Park, and a breathtaking tour of the 7.5-mile U.S. National Arboretum with its dwarf conifer forests,...