As per you request below I am providing you the list of all important and famous places to visit in Delhi also providing you the list of some historical monuments. Please check the below details:

List of places:

India Gate and Rajpath
Sansad Bhavan
Rashtrapati Bhavan
Connaught Place
Lodhi Gardens
Sikandar Lodi's tomb
Bara Gumbad
Shisha Gumbad

Mughal monuments

Purana Quila
Red Fort
Salimgarh Fort
Chandni Chowk
Safdarjung's Tomb

Earlier monuments

Qutub Minar
Tughlaqabad

Places of worship

Akshardham Temple
Laxminarayan Temple
Cathedral Church of Redemption
Gurudwara Bangla Sahib
ISKCON Temple
Jama Masjid
Lotus Temple
St. James' Church
Kalka Ji Mandir

Museums

National Museum, New Delhi
National Rail Museum

Other attractions

Jantar Mantar
Nizamuddin Dargah
Raj Ghat
Shanti Vana
National Zoological Park