Across the road from select city and metropolitan mall in Saket is the Khirki Masjid or the Qila as the locals explain. It was built by Khan-i-Jahan Maqbul Tilangani, the Prime Minister of Feroz Shah Tughlaq (1351--1388) of the Tughlaq Dynasty.
The word 'Khirki' prefixed to masjid is an Urdu word that means "window" and hence is also called "The Masjid of Windows".
The Masjid, which is in a quadrangular shape, was built as a fortress with an unusual fusion of Islamic and traditional Hindu architecture. It is said to be the only mosque in North India, which is mostly covered.
The background score has been sung by Mohit Chauhan, composer is Pritaam from the from the movie New York.
You reach the mosque by getting off at Malviya nagar metro station. exit from gate no 3. take an auto or walk to the select city mall. Walk a little further to the bus stop across the road from the mall. behind the bus stop a little further down is a mandir. The mosque is about 10-20 meters behind the mandir. If you have to ask, ask for the Qila and not the mosques as then you would totally get lost.