The UXO Survivor Information Centre gives Phonsavan visitors human context for the unexploded ordnance that still shapes life across Xieng Khouang. The Plain of Jars is the famous draw, but this kind of stop explains why travel here comes with such a heavy modern history.
Expect a serious visit rather than a conventional museum outing. Pair it with the MAG Visitor Centre if both are open; together they make the landscape outside town much easier to understand responsibly.