The fort is built in a series of seven concentric fortification walls with various passages, a citadel, masjid, warehouses for grains and oil, water reservoir and about 18 temples. Among the ancient temples the most interesting is the hidambeshwara temple. The masjids was an addition during hyder ali's rule. The fort's many interconnecting tanks were used to harvest rainwater, and the fort was said to never suffer from a water shortage. This is also called as the fort of stones or the 'kallina kote'. The other names used in kannada are 'ukkina kote' steel fort and 'yelu suttina kote' known as 'seven circles fort'.