The Buddhist architecture developed in South Asia in the 3rd century BCE and included three main structure types - monasteries (viharas), stupas, and temples (chaitya grihas). Stupas began as structures to house Buddhist relics and later became incorporated into chaitya-grihas or temple halls. Pagodas evolved from stupas and spread across Asia, incorporating regional architectural details. Distinctive Buddhist structures like stupas, pagodas, viharas, and cave temples quietly illustrate the development of Buddhism over different eras.