About the location (from Wiki):
Humayun’s tomb is the tomb of the Mughal Emperor Humayun. The tomb was commissioned by Humayun’s wife Hamida Banu Begum in 1562 CE, 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, that Humayun founded in 1533. It was also the first structure to use red sandstone at such a scale. The tomb was declared a UNESCO World 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.

The site was chosen on the banks of Yamuna river, due to its proximity to Nizamuddin Dargah, the mausoleum of the celebrated Sufi saint of Delhi, Nizamuddin Auliya, who was much revered by the rulers of Delhi, and whose residence, Chilla Nizamuddin Auliya lies just north-east of the tomb. In later Mughal history, the last Mughal Emperor, Bahadur Shah Zafar took refuge here, during the Indian Rebellion of 1857, along with three princes, and was captured by Captain Hodson before being exiled to Rangoon. At the time of the Slave Dynasty this land was under the ‘KiloKheri Fort’ which was capital of Sultan Kequbad, son of Nasiruddin (1268–1287).

Movies shot at this location:
Shukran Allah song from Kurbaan
Bol Na Halke Halke song from Jhoom Barabar Jhoom
Pyaar To Hona Hi Hai song from Sunday
Choomantar song from Mere Brother Ki Dulhan