Marmaris Old Castle is located in the center of Marmaris, on a hill above the harbor and the streets of the old town. It is one of the few places in the city where the connection between the ancient past of the coast and the Ottoman period can be clearly seen. Early legends about the fortress having an extremely ancient origin do not have reliable confirmation; however, it is known that fortifications existed on this site long ago, and the complex mainly acquired its current appearance in the 16th century during preparations for the Ottoman campaign against Rhodes.

The castle is relatively compact, but it is interesting for its location and preserved layout. The stone walls, inner courtyards, and bastions rise above the bay, so people come here not only for the history, but also for the panoramic views of the port, promenade, and buildings of Marmaris. The climb to the castle passes through the narrow streets of the old town, where a more intimate atmosphere has been preserved than in the coastal part of the resort.

Inside is the Marmaris Museum. The exhibition includes archaeological finds from the surrounding area, amphorae, items from the ancient, Hellenistic, Roman, and Ottoman periods, as well as materials telling the history of the region. Thanks to the museum, a visit to the castle becomes not only a walk to a viewpoint, but also an opportunity to better understand the past of the southwestern coast of Turkey.

Today, Marmaris Old Castle is of interest to those who want to see the historic part of the city beyond the beaches and promenade. It is worth keeping in mind that the road here goes uphill, and inside there are stairs, uneven stone, and changes in elevation, so it is better to choose comfortable shoes for the walk.