Sindhudurg Fort was constructed by Shri Chhatrapati Shivaji Maharaj in 1664-67 on rocky island known as Kurte, a km from the Malvan beach. The construction was done under the supervision of Hiroji Indulkar.The Fort is spread in 48 acre and the fort has a 4 kms long zigzag line of 9 metres high and 3 metre wide rampart with 42 bastions. The Fort has huge stones and has 200 khandis of iron erecting the massive curtain wall and bastions and the stones are laid on molten lead.
After Great Shivaji Maharaj, Sindhudurg fort passed through the hands of Rajaram-Tarabai,Angres, Peshwa and the Bhosales of Kolhapur. The British in 1765 AD captured and renamed as 'Fort Augustus'. In 1818 AD, the British dismantled the fort's defence structures.
The fort is approachable from Malvan by boat from two islands of Dhontara and Padmagad. The main gate, flanked by massive bastions, face the city. The fort has Palm and Footprint of The Great Shivaji Maharaj preserved in dry lime .The fort also has the Temple of Shivaji Maharaj-the only one of its kind in the country.The fort has some temples, tanks and three wells.The fort houses some twenty hereditary families.