Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Natural History Museum of Los Angeles County opened in Exposition Park, Los Angeles, California, USA in 1913 as the Museum of History, Science, and Art. The moving force behind it was a museum association founded in 1910. Its distinctive main building, with fitted marble walls and domed and colonnaded rotunda, is on the National Register of Historic Places. Additional wings opened in 1925, 1930, 1960, and 1976.