- Chesapeake and Ohio Canal@
- Glen Echo Park Partnership for Arts and Culture
 - Nonprofit organisation to manage day-to-day park operations. Site includes information on the park, including activities, classes, and carousel schedule. - Prince William County Parks
- From the County Park Authority. With pictures, facilities and maps.
- Piscataway Park@
- Antietam National Battlefield
- Site of the battle that halted Robert E. Lee's first invasion of the North in September 1862. Features park information, battle anniversary schedule, and more.
- Harpers Ferry National Historical Park@
- Manassas National Battlefield Park
- Scene of the battles of First and Second Manassas (also known as the First and Second Bull Run). Includes travel information, activities, and events calendar.
- Fredericksburg and Spotsylvania National Military Park@
- Cedarville State Forest
- Offers hiking, biking, and equestrian trails; camping sites; and fishing and hunting opportunities.
- South Mountain State Park
- Maryland park offering 10,000 acres for year-round hiking along the Appalachian Trail.
- George Washington Memorial Parkway@
- Monocacy National Battlefield
- Site of the battle also known as the "Battle that saved Washington." Includes battle overview, events calendar, and travel information.
- Prince William Forest Park
- Great Falls Park
- 800 acre park located along the Potomac River, 14 miles upriver from Washington D.C.
- Frying Pan Park
- Working farm that recreates rural America in the years from 1920 to 1940.
- Caledonia State Park
- Cowans Gap State Park
- Baltimore-Washington Parkway
- 29-mile scenic highway that connects Baltimore with the nation's capital.
- C.M. Crockett Park
- Recreational park with Germantown Lake, boat rentals, picnic shelters, nature trails, fishing piers, boat ramp, and disc golf course.
- Allegany County Parks
- Charles County Parks
- Frederick County Parks
- Montgomery County Parks
- St. Mary’s County Parks
- Washington County Parks
- National Garden
- At the United States Botanic Garden.
- Rock Creek Park@
- National Mall
- Open space and parklands dedicated to national expressions of remembrance, observance, and protest. Site includes memorials and events.
- Parks & History Association
- Supporting America's National Capital parks and historic sites.
- Washington D.C. Area Rail Trails
- Listings and maps of popular Rail-To-Trail Parks.
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