Watchtower of Torrelodones
The Watchtower of Torrelodones (Spanish: Atalaya de Torrelodones) is an Islamic-era construction located in the Spanish municipality of Torrelodones, Community of Madrid, Spain. It was erected at some point during the Umayyad period of Al-Andalus, between the ninth and eleventh centuries.
Source: Wikipedia — Watchtower of Torrelodones (CC BY-SA 4.0)