The Potomac River roars over rocks and ice in this winter shot from Great Falls Park in Virginia. A short drive from downtown Washington, D.C., Great Falls and Chesapeake & Ohio Canal National Historical Park on the opposite bank in Maryland offer terrific outdoor recreation. Locals will tell you, it’s home to some of the best views and hiking in the area. Be sure to obey all signs and stay away from the falls. Photo by National Park Service.