Ingenious overlay illustrations set this series of books apart. In this volume, the Colosseum, the Forum, the Capitoline Hill and other monuments are shown first as they look today and next, via overlaid acetate illustrations, as they looked in their heydays. We love this method of relating the ruins to their original selves. It's so intuitive. The text is good, too. Published in Italy, the series is distributed in the U.S. by the Getty.  (ITL422, $29.95)