According to the historian Herodotus, there was a castle in Marmaris in the year 3000 BC. During the Hellenistic Age, Caria was invaded by Alexander the Great and the castle was destroyed. It was reconstructed from scratch in the year 1522 by the Ottoman sultan Süleyman the Magnificent when he set it as a basis for his campaign on Rhodes. From the year 1979, renovation work has taken place and still continues, in order to bring it back to its original form. Under the auspices of the Ministry of Culture, the castle became a museum. There are 7 galleries, and the biggest is being used as an exhibition hall and the courtyard is decorated with flowers giving it a lovely setting. Admission: 3 euros.