Lititz, PA has a lovely old Moravian Church that hosts Bach’s Christmas Oratorio every year. It’s also the site of the oldest girls’ boarding school in the US, Linden Hall. Also, the Moravian Bookstore in historic Bethlehem, founded in 1745, used to be one of my favorites.
I also grew up in SE Pennsylvania. There are fascinating little denominations there: Schwenkfelders, Brethren in Christ, “new” Mennonites, Hutterites. The Swedenborgians are centered in the lovely village of Bryn Athyn just outside Philadelphia. The Gothic/Romanesque cathedral is a marvel as is the Pitcairn castle.