Mamallapuram, a 7th-century port city is a tourist attraction in the corridor and is an UNESCO World Heritage Site. Pancha Rathas, Thirukadalmallai (a Lord Vishnu Temple), Descent of the Ganges (a giant open-air bas relief), Arjuna's Penance (a relief sculpture) are some of the attractions in the city. An underwater city named Seven Pagodas existed which had 7 shore temples out of which only one stands at the shore of Bay of Bengal at present.