The 1817 organ of Iruecha Monument · Arcos de Jalón, Tierra de Medinaceli, Soria Image of Arcos de Jalón, not of the place itself. The church of San Juan Bautista preserves an organ built in 1817 and keeps up the Rosario de Faroles, a night-time procession with lanterns that is revived each year during the August festivities. Photo: Luis Rogelio HM (CC BY-SA 2.0) What to see and do in Arcos de Jalón