Plain of Jars Festival in Phonsavan
The Plain of Jars near Phonsavan, in Xieng Khouang province, is a genuine UNESCO World Heritage site (listed 2019) containing roughly 3,000 megalithic stone jars across about 100 locations, believed to date back 1,500 to 2,000 years. A standalone 'Plain of Jars Festival' at the site itself could not be independently confirmed, though the region does host a real Hmong New Year Festival.
Scattered across roughly 100 sites in Xieng Khouang province, close to the town of Phonsavan, the Plain of Jars holds an estimated 3,000 carved stone jars whose original purpose, likely tied to ancient burial practices, remains a subject of ongoing research.