Delhi, known locally as Dilli and also by the official name National Capital Territory of Delhi (NCT), is the largest metropolis by area and the second-largest metropolis by population in India. It is the eighth largest metropolis in the world by population with more than 12.25 million inhabitants in the territory and with over 15.9 million residents in the National Capital Region region (which also includes Noida, Gurgaon, Faridabad and Ghaziabad). The name Delhi is often also used to include some urban areas near the NCT, as well as to refer to New Delhi, the capital of India, which lies within the NCT.

The Mughal Empire ruled northern India for more than three centuries, with a sixteen-year hiatus during the reign of Sher Shah Suri from 1540 to 1556. During 1553-1556, Hemu Vikramaditya acceded to the throne of Delhi by defeating forces of Mughal Emperor Akbar at Agra and Delhi. However, the Mughals reestablished their rule after Akbar's army defeated Hemu during the Second Battle of Panipat. Shah Jahan built the seventh city of Delhi that bears his name (Shahjahanabad), and is more commonly known as the "Old City" or "Old Delhi".

Tomb of Akbar :
Spread in an area of 119 acres in Sikandra a suburb of Agra the Tomb of Akbar the Great is an important architectural masterpiece. The construction of the tomb was The third Mughal Emperor Akbar the Great (1542 - 1605), himself commenced its construction in around 1600, according to Tartary tradition to commence the construction of one's tomb during one's lifetime. Akbar himself planned his own tomb and selected a suitable site for it, after his death, Akbar's son Jahangir completed the construction in 1605-1613. The buildings are constructed mainly from a deep red sandstone, enriched with features in white marble.

Khirki Masjid :
During the time of the Tughlaq dynasty of the Delhi Sultanate, a unique structure Khirki Masjid was built. An extraordinary thing of building of mosques is that the area of the mosque is covered completely by a roof. The architectural achievement of the Tughlaq dynasty and also a forerunner of later-day magnificent Islamic structures of India is reflected in the Khirki Masjid. Roots of Indo-Islamic style of architecture spread in the Indian subcontinent during the time of the Delhi Sultanate (AD 1191-1526) and Khirki Masjid is one of the examples.

Kalkaji Temple:
Kalkaji Temple's oldest portion of the existing temple dates back to 1764. The holy complex is built in the middle of 18th century. Raja Kedarnath, Peshkar of Emperor Akbar II in the middle of the 19th century made certain changes and additions to the temple. The original temple was worship Goddess Kali by the Pandavas and Kauravas is the belief. Navratras occasion is celebrated very grandly in the temple premises. The entire temple is made up of white marble and black granite tiles.

Mubarak Shah's tomb :
Mubarak Shah's tomb is popular for being one of the best octagonal Sayyid tombs and is located in the Kotla Mubarakpur area. Mubarak Shah Sayyid, the second ruler of the Sayyid dynasty died, the tomb was built around 1434. 'Low dome, buttresses, and chhatris', are the popular architectural features especially during the Lodi rule are the main features of this octagonal tomb. Arched openings in southern gate and a mihrab in the western side of the octagonal chamber is the interesting of the tomb. The tomb is still an interesting place to visit as the tomb is in ruined condition.

Rashtrapati Bhawan :
The official residence of the President of India is Rashtrapati Bhavan, located in New Delhi. Chuttri, the ancillary dome-like structure on top of the building is an integral part of Indian architectural design. Jalis or Jaalis grilles made from red sandstone are inspired by Indian design. Around a massive square the layout of the palace is designed, and an open area in one room to the sky is the main attraction. The dome in the middle involved a mixture of Indian and British styles.

India Gate
A memorial raised in honor of the Indian soldiers who died during the Afghan wars and World War I is the great monument India Gate. On the walls of India gate the names of the soldiers who died in these wars are inscribed. With black marble the cenotaph in the middle is constructed and depicts a rifle placed on its barrel, crested by a soldier's helmet. In gold the words Amar Jawan (in Hindi, meaning Immortal Warrior) inscribed on each face of the cenotaph.

Laxminarayan Temple :
In honor of the Hindu goddess of wealth, Laxmi, and of her consort, Lord Vishnu the Laxminarayan Temple or the Birla Mandir is built. Many shrines, fountains, and a large garden are housed in the temple complex. In 1622, Vir Singh Deo built the temple, and was renovated by Prithvi Singh in 1793. Statues of Bhagwan Vishnu and Devi Lakshmi are housed in the main temple. In an area of 7.5 acres (30,000 m2) the temple is spread over.

Akshardham Temple :
Akshardham referred as Delhi Akshardham or Swaminarayan Akshardham is a Hindu temple complex in Delhi. Centuries of traditional Indian and Hindu culture, spirituality, and architecture are displayed in the complex. 70 percent of all tourists are attracted by the temple who visit Delhi on the banks of the Yamuna. 234 ornately carved pillars, nine domes, and 20,000 murtis and statues of Hinduism's sadhus, devotees, and acharyas are housed in the complex. Hall of Values, Theatre, Musical fountain, Boat ride, Garden of India, The Yogi Hraday Kamal, Neelkanth Abishek, Narayan Sarovar, Premvati Ahargruh, the AARSH Centre are some of the features in the cmplex.

Qutub Minar:
Qutb Minar is the world's tallest brick minaret located in Delhi. The minaret was completed in 1386 by Firuz Shah Tughluq. 72 meters high (237.8 ft) with 379 steps leading to the top and diameter of the base is 14.3 meters wide and the top floor measures 2.75 meters in diameter is the measurement of great monument Qutub Minar.

The Qutb Minar comprises several superposed flanged and cylindrical shafts, separated by balconies carried on Muqarnas corbels. Fluted red sandstone is used in raising the minar and covered with intricate carvings. Demolishing hundreds of Hindu, Jain and Buddhist temples Qutub Minar was built and the stones from these temples were even used in building the minar.