Castello Barbarossa is an archaeological ruin and ornithological station in Anacapri, on the island of Capri, Italy. It derives its name from the pirate and Ottoman admiral, Hayreddin, nicknamed Barbarossa ("Redbeard"), who stormed it in 1535 and destroyed it in 1544. The construction date is uncertain but it perhaps dates back to the late ninth century. From 1898, the structure, now in ruins, was owned by the Swedish psychiatrist Axel Munthe who donated it to his foundation. The surroundings, interesting for their botanical features, are home to the island's ornithological station.