the answer is the Nanchan temple. more info:
Nanchan Temple is a Buddhist temple located near the town of Doucun on Wutaishan, Shanxi Province, China. Nanchan Temple was built in 782 during China's Tang dynasty, and its Great Buddha Hall is currently China's oldest preserved timber building extant, as wooden buildings are often prone to fire and various destructions. Not only is Nanchan Temple an important architectural site, but it also contains an original set of artistically-important Tang sculptures dating from the period of its construction. Seventeen sculptures share the hall's interior space with a small stone pagoda.