Want to find green in the midst of Kolkata, then your destination could be Chintamani Bird Sanctuary (চিন্তামণি কর পাখীরালয়) in Narendrapur. Truly speaking it's a hidden gem of Kolkata and dream destination for bird lovers or watchers inside the metro, where birds dwell in the long trees or come here every winter.
It is like a Wakanda, the hidden city of Marvel comics.