Castle and keep of Santa Gadea del Cid Monument · Santa Gadea del Cid, Ebro, Burgos Image of Santa Gadea del Cid, not of the place itself. A fortress of eleventh-century origin rebuilt in the fifteenth by Pedro López de los Manrique; the keep survives, six metres to a side, with a round-arched door on the first floor and Gothic ribbed vaulting. Photo: Zarateman (CC0) What to see and do in Santa Gadea del Cid