The Castle was rebuilt and widened by Suleyman the Magnificent during his campaign for the Greek island of Rhodes in 1522. Suleyman the Magnificent used the castle as a military base for his troops. During World War I, the castle was cannon fired by the French Fleet and had a huge damage. Till 1970s, the castle has been an accommodation area.

There are 18 houses, a fountain and an arc inside the castle area. Finally, the castle was restored during the years 1980-1990 and became a museum in 1991. Marmaris Castle has seven indoor areas; two of them are organized as an archaeology lounge and one of them is organized as an ethnography lounge. Remaining areas are used as art galleries and storage. 

Marmaris Castle is situated at the old town of Marmaris, on the hills behind the Marmaris Marina. Marmaris Castle has an outstanding landscape. Highly recommended for a daily trip and see the Marmaris panorama both during the day and night.