"In this photo taken on Sept. 5, 2017, a fountain that Diego Rivera designed featuring the Aztec rain god Tlaloc, stands outside a hydraulic structure called the Carcamo de Dolores, or the Dolores Sump. The monument inside the Second Section of the Mexican capital's Chapultepec Park features a little-known Rivera mural painted to honor Mexico City's water system, called ""Water, the Source of Life."" (AP Photo/Anita Snow)"