A stupa is a hemispherical or tower-like structure enshrining Buddhist relics or commemorating a sacred event or person. The word comes from the Sanskrit for “heap” — originally referring, perhaps, to the funerary mounds of the ancient Indian tradition. After Buddha’s death, his cremated remains were divided and enshrined in eight stupas by the clans and kingdoms that received them. This established the stupa as the primary monument of Buddhist sacred architecture.
Over the following centuries, the stupa form evolved dramatically across different cultures and climates — from the low mounds of the early Indian tradition to the tall dagobas of Sri Lanka, the bell-shaped chedis of Thailand, the tiered pagodas of China and Japan, the ornate chortens of Tibet and Nepal. Beneath the variety of form, the basic function remains: the stupa houses a relic or symbolic equivalent, and to circumambulate it — to walk around it clockwise — is an act of veneration and merit.
A classical Indian stupa typically comprises a raised platform (medhi), a hemispherical dome (anda), a square railing structure on top of the dome (harmika), and a central post or spire rising from the harmika. The spire may bear a series of discs (chattra) representing different planes of existence. The whole structure may be enclosed within a railing (vedika) with gateways (torana) at the cardinal points.
In Nepalese and Tibetan tradition, the harmika typically bears painted eyes on all four sides. In East Asian tradition, the dome elongates into a multi-storied tower — the pagoda — and the relic is typically contained within the base or lower stories.
Not all stupas contain physical relics of the historical Buddha. The tradition distinguishes between relics of the body (sarira), relics of use (objects associated with Buddha or a saint), and contact relics (soil, water, or other materials from sacred sites). Many stupas contain symbolic substances rather than physical relics — texts, precious stones, or ritual objects. The stupa’s capacity to sanctify space does not depend solely on its physical contents; the accumulated veneration of generations is itself understood as a transformative presence.