A huge campaign to save Cambodia’s Angkor Wat is being hailed as a model for other preservation. “Involving some 40 major monuments and hundreds of smaller sites spread over 160 square miles, the restoration work in the region may take another 25 years or more. Yet an initiative — led by France and Japan and coordinated by the United Nations Educational, Scientific and Cultural Organization — has demonstrated a rare commitment to preserving a miracle of human ingenuity in a country too poor to do so itself.”