Rio Scarcelli | Staff Writer 08/19/21   Pennsylvania’s notorious rolling hills and windy roads are a big part of what contributes to a mysterious optical illusion in various parts of the state: gravity hills. Allegheny County’s largest public park, North Park, is home to one of the state’s three gravity hills. The main sight to see is in an intersection between Kummer and McKinney Roads, … Continue reading Gravity Hill…what goes up must come…up?