Japan's castles are a legacy of the samurai era. To maintain their splendor, they sometimes require intricate repairs, such as moving a heavy keep, replacing thousands of roof tiles, or rebuilding walls made of thousands of stones. To preserve these priceless treasures requires a huge investment. This time on Japanology Plus, we examine the art of restoring Japanese castles. Our expert guest, Yoshihiro Senda, is an archaeologist specializing in castles. And in Plus One, making a model castle.