The old anti-aircraft artillery battery of Cuesta de los Presos, in Almería: https://www.outono.net/elentir/2024/02/07/the-old-anti-aircraft-artillery-battery-of-cuesta-de-los-presos-in-almeria/ It was built by the Republican side after a German naval bombardment. Aventuras Entresierras showed it in one of its always interesting videos.