El Mar and water without pumps Curiosity · Real Sitio de San Ildefonso, Alfoz de Segovia, Segovia Image of Real Sitio de San Ildefonso, not of the place itself. The fountains work by gravity alone: water from the mountains fills the pool of El Mar, of 216,000 cubic metres, and eight further reservoirs regulate the pressures. Some jets exceed forty metres, more than Versailles ever reached. Photo: FDV (CC BY-SA 3.0) What to see and do in Real Sitio de San Ildefonso