Last summer Ellen and Peter Derber, 58 and 64, of Manistique, Mich., invited their granddaughter Christine, 10, on a trip to Italy. Taking a day off from their Interhostel tour, they visited the American cemetery at Nettuno, where Ellen's uncle--a soldier killed near Anzio 20 days after the 1944 invasion of Italy--is buried. "Christine accepted the seriousness of it," recalls her grandfather, "knowing that under every cross or Star of David was someone who sacrificed their life just so we could do what we do."
In the aftermath of the Sept. 11 terrorist attacks on America, that travel experience took on...