George Washington Headquarters; Valley Forge National Historic Park. Photo by Classic Film/Flickr (Noncommercial Use Permitted with Attribution).
Historic Valley Forge
The National Park Service protects 3,500 acres in Valley Forge National Historic Park (about 20 miles northwest of Philadelphia, Pennsylvania). All National Parks - All Pennsylvania Parks
Valley Forge is most famous as the winter encampment where General George Washington and the Continental Army experienced extreme hardships during the American Revolution.