A masterpiece of the Maratha architecture, the 17th-century Kolaba Fort, otherwise known as the Alibag Fort is nestled in the Arabian Sea and features two entrances – one opens on the Alibag shores and the other in the sea. This sea fort has managed to survive the passage of time, and inside you will still find a freshwater well, a few temples, cannons, and beautiful carvings of birds and animals on the walls. Its location – perched 25 feet (7.62 meters) above the sea level and surrounded by the shimmering waters of the Arabian Sea from all sides makes it especially spectacular. During the low tide, it is accessible by foot, while during high tide, the only way to reach it is via boat ride from Alibag beach.