The Castle of Mytilene is a historic fortress located on the island of Lesbos in Greece. Built during the Byzantine period, it was later expanded by the Ottomans in the 15th century. The castle offers stunning views of the surrounding area and the Aegean Sea, making it a popular tourist destination. The castle's architecture features thick walls and several towers, showcasing its strategic importance in defending the city of Mytilene. Today, visitors can explore its ruins and learn about the rich history of the island, which has been influenced by various cultures over the centuries.