Castle of Tiedra Monument · Tiedra, Montes Torozos, Valladolid Fortress of the 11th century whose keep, rectangular, reaches twenty metres in height with walls two and a half metres thick. It preserves two circular drum towers and stretches of wall of the repopulation period. A Bien de Interés Cultural since 1985, it was restored and reopened in May 2013. Photo: GFreihalter (CC BY-SA 3.0) What to see and do in Tiedra