What was the effect of the reaction against Hindu elements in Indo-Islamic architecture under Alaud-din- Khilji? Mention the building which reflects this reaction and describe the style of its architecture.

Under Alauddin Khilji, the power of the sultanate of Delhi increased enormously. During his reign, there was a reaction to the Hindu elements of architecture in the building of the Sultanate. Alauddin tried not to have any traits of Hindu architecture in the buildings which he constructed. His two important buildings are Dargah of Nizamuddin Aulia and the Alai Darwaza at the Qutab Minar. The latter is a noble gateway to the mosque enclosure. It is considered a gem of Islamic architecture. In this gateway, one can see the influence of Iranian architecture. Other buildings constructed by Alauddin were Hauzi-Alai, Hauz-i-Khas and Hazar-i-Situn a palace.