Hillfort of la Corona del Castro de Filiel Nature · Lucillo, La Cabrera, León Image of Lucillo, not of the place itself. A fortified enclosure that the residents of Filiel know as the Corona del Castro, one of the many sites in this municipal district where abundant Roman-period remains linked to gold mining are also documented. Photo: Hovallef (CC BY-SA 4.0) What to see and do in Lucillo