Delhi officially the National Capital Territory of Delhi or NCT, is a city and a union territory of India. It is bordered by Haryana on three sides and by Uttar Pradesh to the east. The NCT covers an area of 1,484 square kilometres (573 sq mi). According to 2011 census, Delhi's city population was about 11 million, the second highest in India after Mumbai, while the whole NCT population was about 16.8 million.Delhi's urban area is now considered to extend beyond the NCT boundary to include an estimated population of over 26 million people making it the world's second largest urban area. As of 2016 recent estimates of the metro economy of its urban area have ranked Delhi either the top or second most productive metro area of India. Delhi is the second wealthiest city after Mumbai in India, with a total wealth of $450 billion and home to 18 billionaires and 23,000 millionaires.
The Red Fort is a historical fort in the city of Delhi in India. It was the main residence of the emperors of the Mughal dynasty for nearly 200 years, until 1857. It is located in the center of Delhi and houses a number of museums. In addition to accommodating the emperors and their households, it was the ceremonial and political centre of the Mughal state and the setting for events critically impacting the region
The India Gate, (originally called the All India War Memorial), is a war memorial located astride the Rajpath, on the eastern edge of the ‘ceremonial axis’ of New Delhi, India, formerly called Kingsway. India Gate is a memorial to 82,000 soldiers of the undivided Indian Army who died in the period 1914–21 in the First World War, in France, Flanders, Mesopotamia, Persia, East Africa, Gallipoli and elsewhere in the Near and the Far East, and the Third Anglo-Afghan War. 13,300 servicemen's names, including some soldiers and officers from the United Kingdom, are inscribed on the gate.
Qutb Minar, (also spelled Qutub Minar) at 73 metres, is world's tallest rubble masonry minaret. Qutb Minar, along with the ancient and medieval monuments surrounding it, form the Qutb complex, which is a UNESCO World Heritage Site. The tower is located in the Mehrauli area of Delhi, India. The Minaret of Jam, a UNESCO World Heritage Site in western Afghanistan, is thought to have been a direct inspiration for the Qutb Minar in Delhi, which was also built by the Ghori (Mamluk) Dynasty. Made of red sandstone and marble, Qutb Minar is a 73-metres (240 feet) tall tapering tower with a diameter measuring 14.3 metres (47 feet) at the base and 2.7 metres (9 feet) at the peak. Inside the tower, a circular staircase with 379 steps leads to the top. Qutb Minar station is the closest station on the Delhi Metro.
The Jantar Mantar is an equinoctial sundial, consisting a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis. On either side of the gnomon is a quadrant of a circle, parallel to the plane of the equator. The instrument is intended to measure the time of day, correct to half a second and declination of the Sun and the other heavenly bodies.In the early 18th century, Maharaja Jai Singh II of Jaipur constructed five Jantar Mantars in total, in New Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735.