To better serve the 2008 Olympic Games, the city has invested about 300 million yuan (38.4 million U.S. dollars) in maintenance work on its cultural heritage spots, according to the city's cultural heritage administration sources. Maintenance work on the Great Wall, the Imperial Tombs of the Ming and Qing dynasties (1368-1911), and the Beijing Man Site in Zhoukoudian are underway. Renovation work on the Buddhist Incense Tower at the Summer Palace, the Hall of Prayers for Good Harvest at the Temple of Heaven, and the Qiongdao Island in the Beihai Park, has been completed this year at a cost of 140 million yuan (17.7 million U.S. dollars).