Free Admission Monday at Natural History Museum - see INFO below. The Natural History Museums of Los Angeles County (NHMLAC) include the Natural History Museum in Exposition Park, La Brea Tar Pits in Hancock ParkMid-Wilshire, and the William S. Hart Museum in Newhall. We protect and share more than 35 million specimens and artifacts, the largest natural and cultural history collection in the western United States. But we also explore the nature and culture that surrounds us today, both in L.A. and the world. More Info below.