ruins of assembly hall vihara, with large seated buddha & towering ayutthaya-style spire prang, wat phra si ratana mahathat

archaeology architecture arts assembly ayutthaya biggest buddha buddhism buddhist center chaliang chedi city cob corn department empire fine good gopura hall heritage historic historical image important jayavarman kamphaeng khmer kingdom large mahathat mahayana most northern park parks people phet phra prang rajworawihan ratana reign ruins satchanalai seated site spire stupa sukhothai temple thailand theravada theravadan unesco vihara wat wolrd world