Photo taken on Aug. 2, 2015 shows the view of a stretch of the Padre Tembleque Aqueduct located in Zempoala city, Hidalgo state, Mexico. The Hydraulic System of the Padre Tembleque Aqueduct was built more than 443 years ago and is an outstanding example of the development of the hydraulic systems in America. The Hydraulic System of the Padre Tembleque Aqueduct was listed as World Heritage Site by the UNESCO on early July, 2015. (Xinhua/Isaias Hernandez/NOTIMEX)