Introduction to Libugong Observatory: Libugong Observatory is located above Mena Village. Standing here, you can overlook the central and northern parts of Guam. During the Spanish period, this was the gathering place for leprosy patients on Guam. Apra Harbor Overlook Drive straight up to Nimitz Mountain and you can overlook Guam's natural harbor, which is also one of the best natural harbors in the Pacific.