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The Alai Darwaza was named after the first Khalji Sultan named Ala-ud-din Khalji of the Khalji dynasty.It lies within the Qutb Complex in South Delhi on the southern end of the ancient Quwwat-Ul-Islam Masjid.Alai Darwaza has a domed entrance which is constructed using red sandstone and is decorated with white marble. The walls of the Darwaza are inscribed with Nashk script and is one of the first buildings in India to be built using an Islamic architectural style.