The System Source Computer Museum, located in Hunt Valley, Maryland, USA, exhibits notable computing devices from ancient times until the present. Over 5,000 objects are on display and many of the computational devices are operational. STEM activities are offered to organized tour groups. Admission is $15 for adults, $10 for students, children, veterans, and first responders. The museum is open weekdays from 9:00am until 6:00pm by appointment. Museum docents are available to lead tours. The National Electronics Museum is in the same building, and admission provides access to both museums.