Xuanwu
宣武区
Combination Ticket (including The Hall of Ceremonial Music, The Hall of Abstinence, The Hall of Prayer for Good Harvests, The Circular Mound Altar and The Echo Wall) Nov.1-Mar.31 (next year): 30RMB Apr.1-Oct.31 : 35RMB Resource: http://www.travelchinaguide.com/attraction/beijing/heaven/
Magnificent place...after visiting it I really can imagine how grand the ceremony was in the past for the emperors to worship the heaven. A place you should go...highly recommended if you are interested in architectural of ancient china.