When I had kids in the house, chain pizza was a pretty common quick dinner but I came to despise Domino's, which underwent a recent revamping because so many people disliked the brand. But once you have had old style pizza from the traditional pizza joints, whose recipes are now copied by many upscale pizza places, you won't be satisfied with the chains anymore.
A true classic is the white clam pie from Frank Pepe Pizzeria Napoletana in New Haven, CT, which may be the best pizza town in America. In the West, Pizzeria Bianco's in Phoenix has a national reputation for it traditional pies like its Margherita.
In Trenton, NJ there were two iconic pizza joints: DeLorenzo's Pizza founded in 1939 and the competing DeLorenzo's Tomato Pies founded in 1947. Is there any wonder why our governor is so round?
Pepe's in New Haven is good, they have been featured on the Food Network a couple of times. Always a long wait on weekends. Modern Apizza in New Haven is better though - I think - and they too have a killer clam pie. There are several brick oven pizzerias in New Haven, definitely a pizza 'mecca' -
NYC has a few - Famous John's and John's Famous pizza are landmarks worth trying.