"Philly" is one of America's oldest cities and once the Capital of America! Philly is rich with historical culture. Philadelphia has successfully found away to preserve it's history and incorporate modern corporate architecture into the city's mix. Although Philadelphia has a dense downtown core, it's suburban sprawl has spread in all direction (except into the Delaware river), making the downtown the only real gem. Philadelphia has recently completed it's tallest building ever, the Comcast center.