This large fort also called Sonar Qila, was founded on 12th July, A.D. 1156 on Trikuta hill by Bhati ruler Jaisal. Its fortification walls which are constructed of yellow sandstone without any mortar are strengthened by ninety-nine bastions and corner towers. Numerous bastions are made accessible through gates, viz. Akhay Pol, Suraj Pol, Ganesa Pol and Hawa Pol. The uppermost fortification wall has kanguras, gun-holes and jharokhas (balconies). The major attraction in the fort are group of Jaina temples viz. Parsvanatha temple, Sambhavanatha temple, Sitalanatha temple, Santinatha and Kunthunatha temple, Chandraprabha temple and Rishabhanatha temple. Amongst Hindu temples, Lakshminatha temple is important which was constructed by Maharawal Bairi Singh in A.D. 1437. The fort has tastefully carved palaces e.g. Rang Mahal, Sarvottam Vilas, Gajmahal, Zenana Mahal, Moti Mahal, Bada-Vilas and Jawahar-Vilas.  Amongst the havelis, the Patwa Haveli located outside the old fortification wall (protected by Govt. of Rajasthan) is remarkable for its intricate stone carvings, jalis and mural paintings.