the structure of double-dome corridor constructed with stone masonry ceiling view

balo kaley stupa double dome gumbat gumbatuna history barikot swat valley pakistan balokaley buddhist monastery architecture archaeology khyber pakhtunkhwa site masterpiece ancient archaeological shrine stupas landmark gandharan corridor venue old buddhism temple ruin heritage stone sculpture archeology vihara religion buddha religious famous inside view window light air ventilation ceiling arch structure double-dome constructed masonry