The Roman bridge of San Ciprián Monument · Cerezo de Río Tirón, Montes de Oca, Burgos Of a single round span and sandstone ashlars, with a barrel vault in the intrados, it crosses the river beside the calle de San Vítores. It formed part of the Roman road that joined Tarraco with Asturica Augusta. Photo: Maestro García (CC BY-SA 4.0) What to see and do in Cerezo de Río Tirón