Walk Description: Come join DCNR Service Forester Mark Lewis for a walk through Greendale Cemetery’s scenic Cemetery Run Gorge. See big trees that are entered in the record books for Pennsylvania and some that rival trees found in Cook Forest. The 1.2-mile walk is for all ages; but the terrain is challenging with several steep ascents and descents. This walk is not stroller or wheelchair accessible. Event will be held rain or shine so come prepared for weather.