We remember the past in different ways. World War II produced memoirs (Frank, Wiesel, Tregaskis), histories (Churchill, Shirer, Keegan), novels (Mailer, Jones, Heller), and innumerable films and television documentaries. So did the Vietnam War (Dispatches, A Rumor of War, A Bright Shining Lie, The Best and the Brightest, as well as The Deerhunter, Apocalypse Now, and Platoon). Of course, there are also built memorials, which form the focus of wreath-layings and commemorative ceremonies, but our memory resides in many places. So I find the present custom of making so-called visitor centers an integral part of memorials odd, not to say redundant. A museum was to be a part of the World War II Memorial in Washington, D.C., but was wisely removed. Less wisely, Congress has approved an underground “education center” next to the Vietnam Veterans Memorial, although that project happily appears stalled. The other night, “Sixty Minutes” showed the 9/11 museum under construction at the World Trade Center site. You would have thought that the vast outdoor memorial would have been sufficient commemoration, but we are also to have a vast underground space devoted to the events of that unhappy day. I once visited the Resistance museum in Oslo, the subject of which was the Norwegian resistance to the Nazi occupation during World War II. It is estimated that 40,000 men and women took an active part in the resistance movement. The museum displays included Sten guns, short-wave radios, and miniature tableaux of wartime scenes, with tiny armored cars being sabotaged, and agents parachuting among cotton-batten clouds. It was informative, charming, and low-key in a laid back Scandinavian sort of way. If we must have a 9/11 museum, I wish it were that modest.