What are some places that you think every Pennsylvanian should see?

I’ve lived in PA for 35 years and recently realized there’s so much of the state I’ve never seen before. I’m planning a 7-14 day road trip to take in as much of the state as possible. I’ll be starting in Philly and stopping in Harrisburg, Pittsburgh, and Erie, but what are some lesser-known towns or attractions that that you think every Pennsylvanian should see?