Delhi (/ˈdɛli/, also known as the National Capital Territory of Delhi is a metropolitan region in India that includes the national capital city, New Delhi. It is India's second-most-populous city after Mumbai, and the largest city in terms of area. With a population of 22 million in 2011, the city is the fourth-largest city in the world. The NCT and its urban region have been given the special status of National Capital Region (NCR) under the Constitution of India's 69th amendment act of 1991. The NCR includes the neighbouring cities of Baghpat, Gurgaon, Sonepat, Faridabad, Ghaziabad, Noida, Greater Noida and other nearby towns, and has nearly 22.2 million residents.
Humayun's tomb (Urdu: ہمایوں کا مقبرہ Humayun ka Maqbara) is the tomb of the Mughal EmperorHumayun. The tomb was commissioned by Humayun's first wife Bega Begum (Hajji Begum) in 1569-70, and designed by Mirak Mirza Ghiyath, a Persian architect. It was the first garden-tomb on the Indian subcontinent, and is located in Nizamuddin East, Delhi, India, close to the Dina-panah citadel also known as Purana Qila (Old Fort), that Humayun founded in 1533. It was also the first structure to use red sandstone at such a scale The tomb was declared a UNESCOWorld Heritage Site in 1993, and since then has undergone extensive restoration work, which is still underway. Besides the main tomb enclosure of Humayun, several smaller monuments dot the pathway leading up to it, from the main entrance in the West, including one that even pre-dates the main tomb itself, by twenty years; it is the tomb complex of Isa Khan Niyazi, an Afghan noble in Sher Shah Suri's court of the Suri dynasty, who fought against the Mughals, constructed in 1547 CE.