Wat Phu 

From there the sacred stream flowed down the artificially terraced mountain slope into two sacred reservoirs or barays and finally into the Mekong River, whose life-giving waters were believed to sustain the whole of the ancient Khmer Empire. Standing structures within the temple complex include quadrangles, a Nandin Hall, small pavilions, brick towers, stairways and the main shrine, which was dedicated to Shiva.