I've toured 3 of those WW2 American subs, the Seawolf, the Pampanito, and the Bowfin. I also toured the U 505 which is at the Chicago Museum of Industry. My favorite sub to tour has to be the Nautilus. It is open for tour at the Submarine Museum in Groton, Connecticut. It was commissioned in 1954 as the first atomic powered Sub. There was a story about it in our Weekly Reader paper at school. I always wanted to see it and I finally got my chance. It was really neat. There really wasn't that much more room in it than the WW@ subs.