Located 40 km (25 miles) northwest of Yogyakarta on Java, the Borobudur is the one of the most famous Buddhist temple in the world. The Borobudur was built over a period of some 75 years in the 8th and 9th centuries by the kingdom of Sailendra, out of an estimated 2 million blocks of stone. It was abandoned in the 14th century for reasons that still remain a mystery and for centuries lay hidden in the jungle under layers of volcanic ash.