Delhi is a melting pot of cultures and has blended culture because people from all over India come and settle here so one can find different types of people in this city. Delhi's culture has been influenced by its lengthy history and historic association as the capital of India. This is exemplified by the many monuments of significance found in the city; the Archaeological Survey of India recognises 175 monuments in Delhi as national heritage sites. The Old City is the site where the Mughals and the Turkic rulers constructed several architectural marvels like the Jama Masjid (India's largest mosque) and Red Fort.

Three World Heritage Sites—the Red Fort, Qutab Minar and Humayun's Tomb—are located in Delhi. Other monuments include the India Gate, the Jantar Mantar (an 18th century astronomical observatory) and the Purana Qila (a 16th century fortress). The Laxminarayan Temple, Akshardham and the Bahá'í Lotus Temple are examples of modern architecture.

Raj Ghat and associated memorials houses memorials of Mahatma Gandhi and other notable personalities. New Delhi houses several government buildings and official residences reminiscent of the British colonial architecture. Important structures include the Rashtrapati Bhavan, the Secretariat, Rajpath, the Parliament of India and Vijay Chowk. Safdarjung's Tomb is an example of the Mughal gardens style