About , there have been four views: windows, granaries, a name of sacrifice and sites. This paper offers new research ......

天坛始原名天地坛,建于明永乐十八年(公元1420年),在当时的北京内城正阳门外,总面积273公顷,经明嘉靖、清乾隆等朝增建、改建,建筑......