Discover 50 of the best day hikes in the Washington, D.C., area with this essential four-season guide from the Appalachian Mountain Club. If you are looking to explore the trails of Washington, D.C., Maryland, or Virginia, this book is a must-have resource for shorter walks and day-long adventures.   From a historic hike from Roosevelt Island to the Roosevelt Memorial, to a scenic excursion through the mountains of the Shenandoah National Park, and a traverse along the Billy Goat Trail, this guide offers a variety of trails for all ability levels and interests.  An at-a-glance chart highlights the best hikes near public transportation, for kids, and for winter snowshoeing and skiing.