Lalitgiri Buddha Bone-Relic Casket Discovery Site.
Every guidebook mentions the Diamond Triangle but few flag the specific stupa at Lalitgiri excavated 1985-91 that yielded a khandolite stone box holding a silver casket holding a gold casket holding a bone relic of the Buddha — the only such find on the entire east coastWHY NOBODY KNOWS
The relic — confirmed as the Buddha's — was unearthed when ASI excavated the main stupa between 1985 and 1991 and is the reason Lalitgiri is considered the holiest of the three sites — the casket is displayed at the on-site museum — see https://en.wikipedia.org/wiki/Lalitgiri
