Archaeological site of el Cerro de los Guardias Nature · Paracuellos de Jarama, Cuenca del Medio Jarama, Madrid Image of Paracuellos de Jarama, not of the place itself. In the 1970s one of the country's most important palaeontological sites was discovered on this hill, with fossil remains of Miocene animals. Today it is reached by one of the routes of the municipality's restored trail network. Photo: Cruccone (CC BY 3.0) What to see and do in Paracuellos de Jarama