About Sandakada pahana

Sandakada pahana, also known as Moon-stone, is a unique feature of the Sinhalese architecture of ancient Sri Lanka. It is an elaborately carved semi-circular stone slab, usually placed at the bottom of staircases and entrances. First seen in the latter stage of the Anuradhapura period, the sandakada pahana evolved through the Polonnaruwa, Gampola and Kandy period. According to historians, the sandakada pahana symbolises the cycle of Sansāra in Buddhism.
Buddha statue in Borobudur (Indonesia), the world's largest Buddhist temple.

Different types of Buddhist architecture

Buddhist religious architecture developed in the Indian subcontinent. Three types of structures are associated with the religious architecture of early Buddhism: (viharas), places to venerate relics (), and shrines or prayer halls, which later came to be called in some places. The initial function of a was the veneration and safe-guarding of the relics of Gautama Buddha. The earliest archaeologically known example of a stupa is the relic stupa located in Vaishali, .