Rhodes and Egypt. Charles Texier, a 19th century researcher, has mentioned in this work of art of a fort dominating on Physkos Gulf, whose ruins were found at Fineks Mountains. It is known that the Great Alexander, who took over Marmaris in 334 BC has had the fort repaired because of its strategic importance.
The only written reference mentioning about the construction of Marmaris Fort that is located at a high point at the back of the Yacht Harbor, is the travel book of Evliya Çelebi. Evliya Çelebi, who visited Muğla and its surroundings in 17th century, says that Kanuni Sultan Süleyman has ordered the repair of the fort before his Rhodes campaign and that the fort was used as a base during the campaign. In the reference, it is said that the fort was constructed on the main rock having four emplacements, that there were 400 foot walls made of smooth stones, that there were one room for each of warden, imam, mosque caretaker and the guardians, and an inscription on the entrance door. In the work of art, where another history writer Celaloğlu Mustafa tells Marmaris days of Kanuni Sultan Süleyman and his army, the Rhodes campaign and their return to İstanbul, the fort is not mentioned.
Piri Reis, who wrote "Navy Book", does not indicate Marmaris Fort in his work of art, in which he tells Marmaris Harbor in detail, and in the map he drew. In the period between 1494 - 1520, during which Piri Reis drew other forts in Mediterranean and took notes for his book, the existence of a fort in Marmaris harbor was not recorded.
In the light of this information, there is another thought in relation with the date of construction of Marmaris Fort. In accordance with that thought, Kanuni Sultan Süleyman, who ascended the throne in 1520, has demanded the construction of the fort while returning from Rhodes Campaign. Hafıza Sultan caravansary is located at the entrance of the narrow street having steps which leads to the fort. The caravansary, which has a rectangular plan, has seven small and one big rooms and it is covered with arches. In the inscription at the entrance of this building, which is constructed in the same period with the fort, the date 1545 is read. This date supports the thought that the fort and the caravansary were constructed after the campaign, at the same time.
An important part of the fort has been destroyed in 1914 during the First World War with the cannon balls of a French destroyer. In the fort, which is used for settlement by Marmaris people beginning from the pre - Republic period until a recent date, there are 18 dwellings, one fountain and one cistern.

Marmaris Fort has been restored between the years 1980 - 1990 and has been opened to service as Marmaris Museum in 1991. It has seven closed places. The cradle vaulted entrance is opening to the inner garden. The stairs on the right and left of the courtyard provides access to the city walls. Two of the closed areas that are covered with cradle vault are arranged as archeology halls. In these halls and in the garden, the stone opuses collected in the region, amphora