Qila-i-Kuhna Mosque is a mosque located inside the premises of Purana Qila in Delhi, the capital of India.
After Sher Shah Suri defeated Humayun, he occupied Purana Qila. There, he built the mosque for his private use, which became a "symbol of his royal aspiration". The mosque is believed to have been constructed in 1541 CE.
Wikipedia https://en.wikipedia.org/wiki/Qila-i-Kuhna_Mosque
Address New Delhi, India
Coordinates 28°36'35.006" N 77°14'41.314" E