Independence National Historic Park
Annual visitors: 4.3 million
Location: Philadelphia
Size: 55 acres
Founded: 1956
Highlights: Visitors to this park, home to the Liberty Bell and Independence Hall, take a trip back to 1776 and celebrate Ben Franklin and the founding of America. Spanning 20 city blocks throughout historic Philadelphia, the park also includes Washington Square, a landscaped park that houses the Tomb of the Unknown Soldier of the American Revolution.