The castle consists of the towers of French, Italian, English, German, and Spanish (Serpentine), has double body walls, and is constructed using Mausoleum stones that were collapsed by an earthquake. Consider it one of the seven wonders of the world. Since 1522, it has been under the reign of the Ottomans and later the Turkish Republic. It was used as a prison in the 19th century; today it is an Underwater Archeology Museum with a rich collection. Hedgehog-shaped Aryballos that were found in Bodrum Nekropol (Ortakent, a necropolis located in the southern part of the Bodrum peninsula), a golden crown that was found in the Carian Princess Grave in Halicarnassus, Nefertiti's Golden Scarab Seal that was found in the Kas-Uluburun Shipwreck, a golden goblet, and more can be visited in the museum. In 1995, the museum won the "Special Praise" award in the European Museum of the Year Competition. Known as Castle of St Peter or The Crusader castle.