The Plain of Jars is a mysterious archaeological site located in northeastern Laos. It features thousands of large stone jars scattered across the landscape, with some jars weighing up to several tons. The exact purpose of these jars remains unclear, but they are believed to date back to the Iron Age, around 500 BC to 500 AD. The site is divided into multiple locations, with the largest concentration found in Xieng Khouang province. The jars are thought to have been used for burial practices or as storage containers. The Plain of Jars is a significant cultural heritage site and is recognized as a potential UNESCO World Heritage site.