The castle of pool a in Laos, which is a world heritage of Laos. Located on a hill called Phu Phu khwai or away from the old town of Champasak Castle is about 6 km to the Khmer Temple of Preah Vihear is similar to him. Built in the 14th century as the 12 in the reign of God's notruan mahe, it is treated as a stone castle, the oldest.