Festivities of invierno de Castelnou Activity · Castelnou, Bajo Martín, Teruel Image of Castelnou, not of the place itself. Castelnou lights the bonfire of San Antón in January, with the handing out of blessed bread, as part of the cycle of santos capudos — San Antón, San Sebastián, San Valero — that marks winter in the Bajo Aragón of Teruel; its main festival is in May, for San Isidro. Photo: B25es (CC BY-SA 4.0) What to see and do in Castelnou