You are lucky, I just do some research on the Beijing Temple of Heaven. It is said that the area is four times of the Forbidden City. And is encircled by an outer wall of 6,553 meters and an inner one of 4,152 meters. Seems most of the vital buildings are in the inner wall. Its main building is the Hall of Prayer for Good Harvest is 38 meters in height, a totally wooden building. There is also a long walkway from south to north, 360 meters long, wow, and 30 meters wide.