In the mid-15th century, on the site of a former Seljuk fortress, the Johannite Knights built St Peter's Castle of green granite. The fortress has double walls. The towers are named after the countries of the Ioannite Order: English, French, German and Italian. In addition, there is another tower, the Liman, or Port Tower, which today serves as the main entrance to the castle. Another Another gate is the so-called "North Entrance with Moat", which faces the main square of Bodrum and served as the main entrance to the castle. Bodrum and served as the entrance to the castle from the shore.
In its heyday, the castle was inhabited by perhaps 50 knights from seven different European countries and three times that number of common soldiers. Their main was the defence of the castle and its surroundings.
In 1453, the castle remained the only Christian fortress in the territory of Anatolia. At this time it was reconstructed, fortified and 14 cisterns were built to to store water during the siege. However, in 1522, the castle surrendered and was soon abandoned. In the 19th century, the castle was turned into a prison and the chapel of the castle was converted into a mosque. was converted into a mosque.
Since 1960 the Museum of Underwater Archaeology has been open here, where underwater finds are kept: amphorae, amphorae, amphorae, underwater archaeological archeological artefacts. finds: amphorae recovered from the bottom of the sea, coins and weapons. On the open alley on display are ancient sarcophagi, including a sarcophagus with the skeleton of Princess Ada, sister of the legendary Mausolus.
