Pa.....ya have Gettysburg,the Pa Dutch country and Metro Philly and all it's history
Maine....probably Kitteybukport and the Bush compound,Arcadia park....Boothbay Harbor,Red's Eate in Wiscassett
Ct...Mystic Seaport
NH...Portsmith Harbor,Quaint NE seaport, north Conway area
Agree with all the above but it's Kennebunkport, Kittery, Acadia and Wiscasett. Correct spelling will make them a bit easier to do net searches.
When do you plan on going? Reservations may be necessary due to timing. You might want to cut back on the number of places so you don't spend the whole time driving. For photography my suggestions would be the battlefields of Gettysbury, the sunset at the Bar Harbor KOA, a drive up to the top of Cadillac Mountain in Acadia National Park, the north shore of MA (Gloucester, Rockport, Newburyport, also fills the bill for quaint towns) and the scenery along the back roads in almost any New England state and upstate NY, especially if you come in the fall.