Waters of La Margarita of Loeches Curiosity · Loeches, Cuenca del Henares, Madrid Image of Loeches, not of the place itself. In 1851 a sodium sulphate spring appeared on the Calvario hill, giving rise to the La Margarita spa; bottled and sold as a purgative all over Spain, the water of Loeches sustained the village's fame until the 1920s. Photo: jl.cernadas (CC BY 2.0) What to see and do in Loeches