Of historical interest is the central stupa containing the ashes of King Sisavang Vong, the final king of Laos, and his brother.
The larger stupa behind the sim dates from 1818 and is said to contain a relic of the Buddha. The sim is similar in style to nearby Wat Mai and Wat Wisunalat, but the main attraction is the huge bronze Buddha image inside, which weighs some 600 kilograms.
Many novices live at this temple, making it a solid bet for some monk chat if that's what you are looking for.
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