Explanation:

 There are 2 UNESCO listed heritage sites in westbengal :

1.The Sundarbans National Park, the largest estuarine mangrove forest in the world is a National Park, Tiger Reserve, UNESCO World Heritage Site and a Biosphere Reserve located in the Sundarbans Ganges river delta bordering the Bay of Bengal, in West Bengal.. It was included in the year 1987.

2.The Darjeeling Himalayan Railway, nicknamed the "Toy Train", is a 2 ft (610 mm) narrow gauge railway from New Jalpaiguri to Darjeeling in West Bengal, run by the Indian Railways. It was included in the year 1999