Now look closely at the surface of the lake. Hidden beneath it is a huge arrangement of jets, nozzles and lights. The system spans more than 1,000 feet in front of the hotel, and it holds a staggering amount of water, around 22 million gallons. Figures for the nozzles and lights run into the thousands, which helps explain why this is called a marvel of engineering as much as of entertainment. The real magic is the choreography. Each song has its own routine, and the water shoots, spins and settles to match the music. Tradition holds that the very first performance was set to Andrea Bocelli's Con te Partirò, also known as Time to Say Goodbye, and that it was a perfect match of voice and water. All of this sits outdoors in the desert, exposed to sun, wind and dust. That means the water, lighting and sound systems need constant inspection and repair so the show keeps running smoothly. Strong winds can even pause the show for safety, so a calm evening is a gift.