While at Laos, a visit to the Plain of Jars is definitely worthwhile. From Luang Prabang, drive towards Xiengkhuang province. On your way, stop at Houi Hei that offers great views of the surrounding mountains. Also visit the Buddha Cave which played a major role in the time of Vietnam War. This served as an army hospital during the war. Stay at Phonsavan, the provincial capital of Xiengkhuang province.Day 6: Trip to the Plain of Jars