While the Philadelphia area has an abundance of green spaces, much of it is relatively flat. There is much to be said about our wonderful rail trail system, but sometimes you just crave a good rock scramble. Though our friends in mountainous areas of the country may think our “hills” are quaint, there’s nothing quite like the geography of Pennsylvania (it’s not called Rocksylvania for nothing!) Not far off Route 73 in Schwenksville, the 101-acre Meng Preserve offers shady trails and the opportunity to see and hear migratory songbirds. Gifted to the Valley Forge Audubon Society in 1991 by Eva R. Meng and now owned by Natural Lands, the Meng…