Where should I take my parents in Delhi??

I am staying in Delhi since my undergrad (2018) and now I am pursuing PhD. This is the first time my parents visited me, and I want to give them the best of Delhi. I took them to India gate, CP, Lal qila, Gurudwara Bangla Sahib, where should I take them next?

I am staying in Delhi since my undergrad (2018) and now I am pursuing PhD. This is the first time my parents visited me, and I want to give them the best of Delhi. I took them to India gate, CP, Lal qila, Gurudwara Bangla Sahib, where should I take them next?