Castillo de Unzueta Historical milestone · Orozko, Arratia-Nerbioi, Bizkaia Image of Orozko, not of the place itself. Remains of an 11th-century medieval castle, destroyed in the 14th century by order of Pedro I of Castile during the factional wars and Castilian civil conflicts. siglo XI (construcción); siglo XIV (destrucción) Photo: wyup (CC BY-SA 3.0) What to see and do in Orozko