In Buddhism, a stupa (स्तूप, ) is a mound-like or hemispherical structure containing relics (such as śarīra – typically the remains of Buddhist monks or nuns) that is used as a place of meditation.
Circumambulation or pradakhshina has been an important ritual and devotional practice in Buddhism since the earliest times, and stupas always have a pradakhshina path around them. The original South Asian form is a large solid dome above a tholobate or drum with vertical sides, which usually sits on a square base. There is no access to the inside of the structure. In large stupas there may be walkways for circumambulation on top of the base as well as on the ground below it. Large stupas have or had vedikā railings outside the path around the base, often highly decorated with sculpture, especially at the torana gateways, of which there are usually four. At the top of the dome is a thin vertical element, with one of more horizontal discs spreading from it. These were chatras, symbolic umbrellas, and tend not to have survived, if not restored. The Great Stupa at Sanchi, Madhya Pradesh, is the most famous and best-preserved early stupa in India.
Apart from very large stupas, designed to attract pilgrims, there were large numbers of smaller stupas in a whole range of sizes, which typically had much taller drums, relative to the height of the dome. Small votive stupas paid for by pilgrims might be less than a metre high, and laid out in rows by the hundred, as at Ratnagiri, Odisha.
As Buddhism spread, other forms were used for the same purposes, and the chortens of Tibetan Buddhism, and the pagodas of East Asian Buddhism are some of these. In South-East Asia various rather different elongated shapes of dome evolved, leading to high, thin spires. A related architectural term is a chaitya, which is a prayer hall or temple containing a stupa.
CetiyaTumulus and Megalith
Stupas may have originated as pre-Buddhist tumuli in which śramaṇas were buried in a seated position called chaitya.