Castle-alcázar of Laguna de Negrillos Monument · Laguna de Negrillos, El Páramo, León Image of Laguna de Negrillos, not of the place itself. A fortress on a quadrangular plan of more than eleven hundred square metres, with a battlemented five-storey keep, the Queen's tower and two round towers at the southern corners. It was declared a monument on 22 April 1949. Photo: Adolfobrigido (CC BY-SA 4.0) What to see and do in Laguna de Negrillos