North Side district. The Mattress Factory is a museum of contemporary art that presents art you can get into - room-sized environments, created by in-residence artists. Located in the historic Mexican War Streets of Pittsburgh's North Side since 1977, the Mattress Factory is one of few museums of its kind anywhere. Also a location at 500 Sampsonia Way. Tues-Sat: 10am - 5pm. Sun: 1-5pm. Adults: $6. Senior citizens and students: $4. Children: FREE