Rice Terraces of Cordilleras
One of the engineering and hydraulics wonders of the  world, the terraced fields now planted with rice have been declared by the UNESCO as a World Heritage Site. Perfect examples of these are the terraces found in Banaue, Hungduan, Mayoyao and Kiangan. It was built entirely by hand, and is as old as 2,000 years. Can you do that with your hands?