The southern gateway of the Quwwat-ul-Islam Mosque lies in the Qutub Complex in Delhi, India. Built by Sultan Alauddin Khalji in 1311 and made of red sandstone, it is a square domed gatehouse with arched entrances and houses a single chamber. It has a special significance in Indo-Islamic architecture as the first Indian monument to be built using Islamic methods of construction and ornamentation and is part of a World Heritage Site.