The Park Office for Pennsylvania's "Bald Eagle State Park" is located to the west of Main Park Road, a short distance from the park entrance.  The staff here can help direct you to places in the park where you may be most likely in the late summer to find Monarch eggs, larvae, chrysalises, and butterflies.  The Park Naturalists also occasionally offer programs that involve Monarchs (e.g. the "Butterfly Hike" and "Marvelous Monarchs").  From here, your next stop will probably be at the beginning of the "Butterfly Trail".

      Latitude:        41.03445°N
      Longitude:    77.65102°W

               - Tim