"Phra That Phanom has been highly revered as a sacred monument for both the Thai and Laotian people for centuries. The Urangkha That
(the chest bone relic) of the Lord Buddha is believed to be housed in Phra that Phanom at Wat Phra That Phanom, Nakhon Phanom Province."
Ancient City (Muang Boran), Bangkok, Thailand