The Mattress Factory is Pittsburgh's museum for installation art, set in a former industrial building on the North Side. Instead of conventional galleries, it specialises in room-sized works that you walk into, around, and through.
The museum is one of the city's best stops for contemporary art because the work is made for the building and often feels playful, strange, or disorienting in person. Pair it with the nearby Andy Warhol Museum or the National Aviary if you are spending the day on the North Side.