Get your history on the move and enjoy the official audio tour of Valley Forge National Historical Park by car or bike! Learn about the momentous winter encampment of 1777-1778 and the birth of a professional United States army. This tour was produced by The Encampment Store in conjunction with the National Park Service. The Encampment Store is a non-profit 501 (c)3 cooperating association whose mission is to support the interpretive, educational, scientific and historical activities of Valley Forge National Historical Park.