2 and 4, tiny guys. They would enjoy the Phila. Zoo, Sesame Place, Please Touch Museum, and now they have Ride The Ducks, which takes you on a tour of Historic Phila, and a short river cruise.(about 80 min.) They would love the "quakers" they let kids blow (and adults), but little kids might be a bit bored on the tour. There is a lot to do in Philly, but 4 and 2 are a bit too young for the historical things. I'll try to think of more and post later.