Castle of San José de Valderas Monument · Alcorcón, Área Metropolitana, Madrid A Saxon-looking palace built around 1916 and 1917 by the architect Luis Sainz de los Terreros for the Marquis of Valderas; handed over to the municipality in 1988 and restored afterwards, it has housed the Alcorcón Museum of Glass Art since 1997. Photo: Juan Lupión from Alcorcón, Spain (CC BY 2.0) What to see and do in Alcorcón