The ruins of Alamparai Fort (also called Alampara) lie near Kadappakkam, a village 50 km from Mamallapuram on the land overlooking the sea. Constructed in the late 17th century during the Mughal era, the Alamparai Fort once had a 100-metre long dockyard stretching into the sea, from which zari cloth, salt, and ghee were exported. During 1735 AD it was ruled by Nawab Doste Ali Khan. In 1750, for the services rendered by the famous French commander Duplex to Subedar Muzarfarzang, the fort was gifted to the French. When French were defeated by the British, the fort was captured and destroyed in 1760 AD. More recently the structure was damaged in the 2004 Indian Ocean earthquake.