Bridge of hierro sobre el Henares de Torrejón Monument · Torrejón de Ardoz, Área Metropolitana, Madrid Image of Torrejón de Ardoz, not of the place itself. An 1889 metal structure thrown across the River Henares, its design indebted to the Eiffel school; out of service for decades, it is one of the few pieces of 19th-century engineering preserved in the Henares corridor. Photo: Zarateman (CC BY-SA 4.0) What to see and do in Torrejón de Ardoz