Enjoy a family fossil filled day at the Museum of Natural History OR The Page Museum! The mission of the Natural History Museum of Los Angeles County is to inspire wonder, discovery and responsibility for our natural and cultural worlds. Open seven days a week, 9:30 am - 5 pm, all year, except for the following holidays! New Year's Day (January 1), Independence Day (July 4), Thanksgiving Day (fourth Thursday of November), and Christmas Day (December 25).