Romanesque tower of Santa Marina de Barrillos Monument · La Ercina, La Montaña de Riaño, León The church of Santa Marina preserves a thirteenth-century Romanesque tower and a Renaissance altarpiece with reliefs of the apostles, the most notable artistic ensemble of a municipality spread across fourteen small settlements. Photo: David Perez (CC BY-SA 4.0) What to see and do in La Ercina