Castle of Matrera - Credit: Wikimedia Commons
Castle of Matrera () is a medieval castle at Villamartín near Prado del Rey in Spain dating back to the 9th century. It was declared a national monument in 1949 and an example of Bien de Interés Cultural ("Heritage of Cultural Interest") in 1985. The structure underwent a controversial restoration in 2015. Read more on Wikipedia
Source: en.wikipedia.org