At the confluence of two rivers near the Guadarrama mountains in Spain is Alcázar de Segovia, one of the country’s most distinctive medieval castles. It is known for its unique shape resembling a ship’s bow. Originally built as a fort in the 12th century, it eventually became a preferred residence for the Castilian monarchs for much of the Middle Ages, housing notable figures like Queen Isabella I. After the royal family moved to Madrid, the castle was used as a prison and the headquarters of the Royal Artillery School before being converted into the museum it is today.