Castle of the Bishops of Sigüenza - Credit: Wikimedia Commons
The Castle of the Bishops of Sigüenza (Castillo de los Obispos de Sigüenza) is located in Sigüenza in the Province of Guadalajara in central Spain. With foundations dating back to the 5th century, it was extended by the Moors and retaken for the Christians by Bernard of Agen in 1123. Read more on Wikipedia
Source: en.wikipedia.org