Ipolcobulcula Curiosity · Castillo de Locubín, Sierra Sur, Jaén Image of Castillo de Locubín, not of the place itself. At Cabeza Baja de Encina Hermosa, the Ibero-Roman settlement of Ipolcobulcula has been identified, flourishing in the 1st century. Photo: Jerónimo Palacio, en Flickr (CC BY 2.0) What to see and do in Castillo de Locubín