Philadelphia -Pennsylvania’s largest city, is notable for its rich history.It is thefifth-most-populousin theUnited States, with an estimated population in 2014 of 1,560,297.In theNortheastern United States, at the confluence of the Delaware and Schuylkill River, Philadelphia is the economic and cultural anchor of theDelaware Valley, a metropolitan area home to 7.2 million people and theeighth-largest combined statistical areain the United States. It is alsohome to manynational historical sitesthat relate to the founding of the United States.Independence National Historical Parkis the center of these historical landmarks being one of the country's 22UNESCOWorld Heritage Sites.Independence Hall, where theDeclaration of Independencewas signed, and theLiberty Bellare the city's most famous attractions.
Philadelphia is the largest city in , sixth-most-populous city in the United States and the fifty-first most populous city in the world.