Sierro Castle, locally known as Castillo de Sierro, lies on a hill in a small mountain village of the same name in the province of Almería in Spain.
The origins of Sierro Castle date back to pre-Arab times. Also during the time of Islamic rule over the region, from the 9th century until 1125, the site was fortified. During 11th and 12th century there was an abundant Moorish and Mozarabic population here, who had sought refuge in the mountains. Later the area fell under Christian rule.
The remnants of Sierro Castle are situated on a hill in the mountain valley of the Boloynta stream and it protected the small farmer village around it. Its plan followed the outline of the hill.
The present castle however is a folly. It was built in 2011, presumably on the foundations uncovered after archeological excavations, as an employment project. The project was followed by an investigation because it had been done without permits or supervision.
At present Sierro Castle can freely be visited. Although it is a folly, I quite like its appearrance.