Borobudur is a Mahayan Buddhist temple complex located near the modern city of Magelang, Central Java, Indonesia. The huge monument, a popular place of pilgrimage for Buddhists, comprises six square platforms, topped by three circular platforms, decorated with 2,672 relief panels and 504 Buddha statues. It is estimated to have been erected over a 75-year period, ending somewhere around 800 AD during the time of the Sailendra Dynasty of Java, under the leader Samaratungga. Its architect, Gundaharma, is a largely mythical character, thus his efficacy remains uncertain. The monument remained a popular place of worship for the island's Buddhist population - even under Hindu rule. Yet a number of volcanic eruptions around 1000 AD, and the shifting of power to East Java, meant Borobudur's prominence waned. And many historians believe the island's change of religion to Islam around the fifteenth century meant that the site became derelict.