Udgir Fort is a 12th-century fort famous for the treaty of Udgir which was a result of the battle between the Marathas, led by Sadashivrao and the Nizams. The fort is named after Rishi Udaygiri Maharaj whose Samadhi rests 60 feet under the ground level of the same fort. The fort is designed in a quadrilateral form with several hall spaces. The surrounding hills have ruins of observation points built of white clay for military purposes. The fort is surrounded by trenches as deep as 40 feet to avoid intrusion. Some parts of the fort have Arabic and Persian inscriptions. The fort is supposed to have underground tunnels that connect to the Bidar and Bhalki forts in Karnataka.