Bodrum Castle was built between 1406-1522 by the Knights of Saint Jean on a rocky peninsula surrounded on three sides by seas between two harbors. In the construction of the castle, one of the seven wonders of the world, which was destroyed during the earthquake, used the stones of Mausoleion. The castle has French, Italian, English, German and Spanish (Serpentine) towers. After the island of Rhodes was taken over by the Turks in 1522, the knights left Bodrum and its surroundings on 5 January 1523. The castle, which was used as a prison since 1895, was abandoned by the bombing of the French and British forces during World War I on May 26-28, 1915.

Today, Bodrum Castle, Bodrum Underwater Archeology Museum is located. It is one of the most important underwater archeology museums in Turkey and one in the world. In 1995, the Museum of the Year in Europe was awarded the “Special Praise” award, as well as works from underwater excavations and surveys, as well as artifacts from excavations and surveys in and around Bodrum. Amphorae, Turkish bath, VII VII. century Eastern Roman Ship, windows, AD XI. Century Serçe Harbor Glass Shipwreck, Yılanlı Tower, Coin and Jewelery Hall, Karyalı Princess, English Tower, Bronze Age Shipwrecks, Dungeon and Commander Tower are the main exhibitions of Bodrum Underwater Archeology Museum.