©N. Santos/Visit Philadelphia
This nonprofit pushes the frontiers of contemporary art by supporting artists who work with experimental materials. Design enthusiasts find plenty to see here, from an extensive permanent collection to special exhibitions, plus lectures and tours. Don’t miss the design-driven gift shop. "Louis Kahn: The Power of Architecture," through Nov. 5. Free. M-F 10 am-6 pm, Sa-Su noon-5 pm.