Philippines - The plaque at Banaue rice terraces, northern LuzonSign reads: 'Ifugao Rice Terraces: The Ifugao Rice Terraces cover an area of nearly 400 square kilometers, and if the walls were placed end to end, they would reach more than half-way around the Earth. Those of Banaue, Hapao, and Hungduan are among the oldest in Luzon. Archaeological and historical studies indicate that it took the Ifugaos more than 2,000 years to build them. The stone-walled terraces of Ifugao are the highest, best built, and most extensive in the world. A single migrating people is believed to have carried the terrace culture from South China or Indo-China across to Luzon and southern Japan, and southward to Java and the lesser Sunda Islands - which are the o...