Puente romano sobre el río Viar Historical milestone · Castilblanco de los Arroyos, Sierra Norte, Seville Image of Castilblanco de los Arroyos, not of the place itself. Three-arch Roman bridge, 15 metres high, over the Viar river, which collapsed in 1907 and later disappeared with the construction of the Melonares reservoir. Photo: Junta de Andalucía (CC BY-SA 2.0) What to see and do in Castilblanco de los Arroyos