Kolaba Fort is located at the distance of around 1 km from the Alibaug Beach in the coastal town of Alibaug. This sea fort was constructed by Maratha warrior, Shivaji Maharaj, which has 25 ft high, 350 ft wide and 900 ft long walls. The fort dates back to around 300 years and was built in 1680. It gained prominence due to the various battles between the Marathas and the Siddis, the British and the Portuguese.The entrance arch of the fort has numerous carvings of elephants, peacocks and tigers. Near the entrance gate, many shrines of god and goddesses are present including Padmavathi, Sri Ganesh, Mahishasura, the fort-deity and Kanifnath. In 1759, Shri Ganesh Temple was built by Raghoji Angre in front of the sweet water tank.