the main stupa of the tokar dara archaeology in the najigram valley

swat khyber pakhtunkhwa pakistan yusafzai state suvastu gandhara udyana tokar dara najigram stupa monastery buddhism buddhist buddha archaeology treasure destroy hemisphere dome gumbatuna gumbat antiquities digger artefact turk shahi bazira najirgram valley vihara site mountain tourism place architecture archeology civilization history hindus ruin kpk kushanas asia 2nd century rocks stones sphere culture monument main