You are right. Many forts are built up by the great Maratha Warrior Chatrapati Shri Shivaji Maharaj. All forts have their historic importance as well as beauty. I have visited many forts in maharshtra like Sinhagad (pune), Raigad (Raigad), Shivanri (pune), Sindhudurg (sindhudurg) etc. Raigad was the main capital fort of the 'swarajya'. Sindhudurg is built in the sea to keep eye on the enemy coming from the sea. There are many forts in maharshtra.
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for sharing information on fort built in Maharashtra.