Built by the Bahamani Kings, this fort dates back to the 16th century. The fort later was taken care of by the Adil Shahis and became their property. After many years, Maratha warrior Shivaji took possession of the fort. And later, this was taken by the British. Ratnadurg fort is a U-shaped fort which is also popularly called as Ganpati Durga Fort. There are temples of Hindu Goddess Durga and God Ganpati inside the fort.