Answer : 2. "शांतिनिकेतन"
Explanation :

#. Shanti Niketan, another historical site of India, has been included in the UNESCO World Heritage Site list.

#. Shanti Niketan ranks 41st in the number of World Heritage Sites in India.

#. It was founded by Rabindranath Tagore.

#. Located in the Birbhum district of West Bengal, Shanti Niketan, meaning "abode of peace", began development in 1901 and it was here that Rabindranath Tagore laid the foundation of Visva-Bharati University.

5. UNESCO World Heritage Site List-

1. Agra Fort

2. Ajanta Caves

3. Archaeological site of Nalanda Mahavihara in Nalanda

4. Buddhist Monument in Sanchi

5. Champaner-Pavagadh Archaeological Park

6. Chhatrapati Shivaji Terminus

7. Churches and Convents of Goa

8. Elephanta Caves

9. Ellora Caves

10 Fatehpur Sikri

11. Great Living Chola Temple

12. Group of Monuments at Hampi

13. Group of Monuments at Mahabalipuram

14. Group of monuments at Pattadakal

15. Hill Forts of Rajasthan

16. Historic City of Ahmedabad

17. Humayun's Tomb

18. Jaipur city

19. Khajuraho Group of Monuments

20. Khajuraho Group of Monuments

21. Mountain Railways of India

22. Qutub Minar and its monuments

23. Rani-ki-Vav (Queen's Stepwell)

24. Red Fort Complex

25. Rock shelters of Bhimbetka

26. Sun Temple

27. Taj Mahal

28. The architectural work of Le Corbusier, an outstanding contribution to the modern movement

29 Jantar Mantar 

30 Mumbai's Victorian Gothic and Art Deco Ensemble

31. Great Himalayan National Park-Conservation Area

32. Kaziranga National Park

33. Keoladeo National Park

34. Manas Wildlife Sanctuary

35. Nanda Devi and Valley of Flowers National Park

36. Sundarban National Park

37. Western Ghats

38. Kanchenjunga National Park

39. Kakatiya Rudreshwara (Ramappa) Temple

40. Dholavira

41. Shanti Niketan