Coca Castle, locally known as Castillo de Coca, lies in flat and wooded lands in the little walled town of Coca (Roman "Cauca"; birthplace of Roman Emperor Theodosius), in the Segovia province in Spain.
Coca Castle was built in the 15th century by Alonso de Fonseca; the mighty archbishop of Seville, during the reign of King Enrique IV of Castile. It's made up of two square baileys separated by a passageway. Both show polygonal towers at the corners. The double walls are 2.5 m thick and it's circled by a deep dry moat. It is considered to be the highest example of brick military architecture with Mudejar filigree work. Mudejar is the architectural style of Islamic craftsmen living under Christian reign.
The castle is owned by the Alva family and now serves as a training center for foresters. Their school is situated in the inner bailey.
The castle can only be visited with a guided tour, taking you through the keep, over the battlements and through one other tower. Unfortunately you'll see a lot of passageways which you wont go in to and you don't get to walk in to moat. But even so it's surely worth your visit.