Geocaching is searching for hidden 'caches' using a GPS device. Four geocaches are located at Libby Hill and you can learn more by visiting Geocaching.com or about these specific geocaches
You can find information on all the geocaches in the Gray, Maine area by using this link to a Google Geocache map for Gray, Maine.
Geocaching.com now provides Google topographic maps. To see the Libby Hill area, go to this link then hit either the 'Topo' to see a topographic map or 'DOQ' to see aerial photography.