Blue Hills Reservation covers approx. 5,800 acres and adjoins Fowl Meadow Reservation. This woodland reservation contains hundreds of different varieties of trees, shrubs and wildflowers, and animals, including many species that are rare or endangered in Massachusetts such as the Timber Rattlesnake. The reservation also contains more than 50 prehistoric sites, 16 historic structures listed in the National Register of Historic Places, 3 National Environmental Study Areas, and a National Historic Landmark - the Blue Hills Meteorological Observatory.