The performance of a fountain -- as long as clients service those 500 jets that are supposed to shootwater 100 feet into the air -- is guaranteed for at least 40 years.
In addition to the Mirage Volcano and the Treasure Island lagoon, there are the Venetian Hotel's canals and the Bellagio Hotel and Casino's fountains, with jets that shootwater skyward, choreographed like showgirls to music.