The Temple and Pagoda in Horyuji, Japan are the oldest wooden buildings in the world. The buildings were originally built in the 8th Century and have survived until now. There is evidence that there were wooden buildings built prior to these, but the ones now standing have survived intact. The trick with any wooden building is to not burn down. The palace in the Forbidden City in Beijing has burned down several times due to lightening and cooking fires. Likewise, the Todaiji temple in Nara has burned down due to fire several times as well. Surviving this long is really more a matter of luck than anything else.