Philadelphia: Topographic Views from Plane

Urban blight in areas around Philadelphia; Largest city in the Commonwealth of Pennsylvania and its only consolidated city-county, the fifth-most-populous city in the United States, and the core of the sixth-largest metropolitan area in the country. The population of the city was estimated at 1,560,297 in 2014. Philadelphia is the center of economic activity in Pennsylvania and is home to seven Fortune 1000 companies; the city's skyline is growing. The 67 National Historic Landmarks in the city helped account for the $10 billion generated by tourism. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 9/3/2015