Hi ! Kapil welcome in DILLI because "DILLI Hai Dilwalo ki" so Stay and enjoy delli.....
Delhi, there are lots of places to see in delhi. like Moghul Monuments Purana Quila (Old Fort), Kabuli or Khuni Darwaja, Feroz Shah Kotla,Kutub Minar, Tughlaqabad, Nizamuddin Aulia, Humayun's Tomb, Lodi's Tomb, Safdarjung's Tomb Jama Masjid, Jantar Mantar and Red Fort (Son-et-lumiere show) india gate, Achardham mandir, Lotus temple, i've been to most of those places and I can say it is one of a kind.
Thansk