Adoni Fort is a 15th century historic monument built during the reign of the Vijayanagara Dynasty. The fort served as a military base and its walls stretch over 50 kilometres in length making it the largest fort in the country. Later, the fort changed hands to Bijapur Sultanate and later Tipu Sultan and British Reign. Ranamandala Anjaneya swamy temple is nearby. It is good for trekking, as there are no guided footpath.