Sorry if this is old news, but I just "discovered" it and thought it would be worth a mention. If you go to the Penn Pilot website, you'll find the entire state has been cross-grid aerial photographed various times since the 30's. Just enter the location of interest, then the time frame desired. each red dot that appears is a photo, interlaced with the surrounding photo's so the entire state is covered. It's certainly not Google Earth quality, but it's a lot better then not knowing what was there before that man made dam was filled or housing development bulldozed in.
Oh yeah, BTW, for the best resolution available, download the high res maps instead of just viewing the pop up.
Oh yeah, BTW, for the best resolution available, download the high res maps instead of just viewing the pop up.