May as well add some of my favourites to the list. You'll find most of these in your atlas (if you brought one home),

There is Route 6 through PA. As the brochure states, 'not so much a route as a destination in itself'. Two hilights (and there are many) which come to mind are The Grand Canyon of Pennsylvania and the Kinzua Bridge, or should I say, the remnants of it. I saw this magnificent tressle bridge in 2001, and on my next visit saw it lying on the valley floor, far below, destroyed by a tornado. Still a great historic site - still worth visiting.

There are the many magnificent historic railway viaducts across eastern PA, one of which can be seen as you drive into NJ on I-80. Just north of Portland PA (south of the Delaware Water Gap) there is a spot where you can get a great picture of it. Another is the railway viaduct at the junction of highway 11 and 92 in Nicholson PA. I can imagine you taking great pictures of these.

The many historic covered bridges of Bedford County PA.

And the lovely hamlet of Jim Thorpe tucked away in the mountains of eastern Pennsylvania. And nearby Hickory Park with the Boulder Field, among other attractions.

There is so much to see in PA, you could spend a month there, and still not see it all. Very different from the great NPs in the west, but just as interesting.

Lifey