A county history museum housed in the 115-year-old former "Old Courthouse" at 2200 Broadway, with rotating exhibits on San Mateo County history and free family programming (docent-led tours, story readings, craft projects) on First Fridays each month. Confirmed directly via the museum's own site: $6 adults, $4 seniors/students, free for children 5 and under. Open Tue-Sun, 10am-4pm (last admission 3:45pm).