Kalan Mosque, also known as Kali Masjid refering to its dark colour, is located at Firozabad
in Uttar Pradesh
. Built by Khan-i-Jahan Junan Shah, the prime minister to Firuz Tughlaq, the mosque was designed and built like a citadel to protect worshippers from attacks. The entrance to the mosque is flanked by two tall towers. The structure stands on a 66 ft high tall plinth, which is accessed by a flight of 32 steps. Inside the building there are about 30 domed bays which form a cloiser. The walls of the mosque are 6 ft thick.
Firozabad Railway Station is nearby. Firozabad is situated 44 km from Agra and 200 km from Delhi.