HIROSHIMA: Few ancient Japanese castles survived the ravages of time--they were made largely of wood. One that did was the castle at Hiroshima, until it was utterly destroyed by the atomic bombing of the city in 1945. The building and grounds have been lovingly restored, and are a major tourist attraction for school groups and others, with exhibits of armor, pottery, etc., including a lively 3-D animated laser cartoon played out on a model of the castle, explaining how it was originally built. Ground zero was practically next door. May 19, 1998