Castle of Cola is an Iron Age residence and Islamic redoubt in the Portuguese Alentejo, classified as a National Monument. The castro is part of a larger archaeological park of Castro da Cola, that includes various Megalithic and Chalcolithic monuments, including necropolises of the Bronze and Iron Ages. The Castro-era polygonal plan, included reinforced blocks, with an entrance controlled by tower. The remaining defensive structure was circled by walls, with still exist, on the neighboring pasture-lands protecting the castle.