▁the ▁monaster y ▁but ▁is ▁no ▁longer ▁ext ant . ▁ ▁Great ▁East ▁Hall ▁ ▁D ating ▁from ▁ 8 5 7 ▁of ▁the ▁Tang ▁D ynast y , ▁the ▁Great ▁East ▁Hall ▁( 东 大 <0xE6> <0xAE> <0xBF> ) ▁is ▁the ▁third ▁oldest ▁dated ▁wooden ▁building ▁in ▁China ▁after ▁the ▁main ▁hall ▁of ▁the ▁Nan chan ▁Temple ▁dated ▁to ▁ 7 8 2 , ▁and ▁the ▁main ▁hall ▁of ▁the ▁Five ▁Drag ons ▁Temple , ▁dated ▁to ▁ 8 3 1 , ▁and ▁the ▁largest ▁of ▁the ▁three . ▁The ▁hall ▁is ▁located ▁on ▁the ▁far ▁east ▁side ▁of ▁the ▁temple , ▁at op ▁a ▁large ▁stone ▁platform . ▁It ▁is ▁a ▁single ▁store y ▁structure ▁meas uring ▁seven ▁b ays ▁by ▁four ▁or ▁ 3 4 ▁by ▁ 1 7 . 7 ▁metres ▁( 1 1 0 ▁by ▁ 5 8   ft ), ▁and ▁is ▁supported ▁by ▁inner ▁and ▁outer ▁sets ▁of ▁columns . ▁On ▁top ▁of ▁each ▁column ▁is ▁a ▁complicated ▁set ▁of ▁brackets ▁containing ▁seven ▁different ▁bra cket ▁types ▁that ▁are ▁one - second ▁as ▁high ▁as ▁the ▁column ▁itself . ▁Support ing ▁the ▁roof ▁of ▁the ▁hall , ▁each ▁of ▁the ▁bra cket ▁sets ▁are ▁connected ▁by ▁cres cent ▁sh aped ▁cross be ams , ▁which ▁create ▁an ▁inner ▁ring ▁above ▁the ▁inner ▁set ▁of ▁columns ▁and ▁an ▁outer ▁ring ▁above ▁the ▁outer ▁columns . ▁The ▁hall ▁has ▁a ▁lattice ▁ce iling ▁that ▁conce als ▁much ▁of ▁the ▁roof ▁frame ▁from ▁view . ▁The ▁hi pped -