There are many gems which people don't know about and I think the lesser they know the more it would stay safe from deterioration.
There are plenty of unexplored and underrated places in Delhi like Jamali Kamali, the forts , tombs, temples and the local markets also.
Rose cafe is a hidden gem , many people don't know of this place.
Adham khan tomb in Mehrauli or bhool bhulaiya in local language
Patta Cafe at Champa Gali deserves more attention! They have amazing food.
I think most of us have not visited the Cafes Lota which is very good