If your friend (not from Delhi) is coming to Delhi to travel and explore the city, what places do you suggest him/her so that he/she can see the culture and heritage of the beautiful city Delhi.
Every place in delhi is worth visiting. But to specifically explore culture & heritage, you can visit various monuments like India Gate, Qutub Minar, Lotus Temple and some market's like Chandni Chowk, Khan Market, Janpath Market, etc.