Kolaba Fort

Kolaba Fort is Alibaug's most iconic attraction — a 17th-century Maratha sea fort by Chhatrapati Shivaji on a tidal island just offshore, accessible on foot at low tide or by boat at high tide. Remarkably well-preserved, with ancient cannons, temples, and freshwater wells within its walls. A top Alibaug sightseeing and heritage destination. Free entry; check tide times before visiting. Best explored with a local guide for historical depth. The low-tide walk across the sandy causeway is memorable.