This beautiful piece of architecture is named so because of the fair that is held here for a period of two and a half days. Adhai Din Ka Jhonpra is a mosque that was built under the supervision of the king Qutub-ud-Din Aibak who was the reigning sultan of Delhi at that time and it offers a glimpse of the Indo Islamic style of architecture.
The interior of this mosque is designed on the composition of a temple because it is believed to be built after destroying a temple. This mosque is beautifully designed, with the main hall being supported by a number of columns. As the columns gain height their large base becomes tapering. Various images of gods and goddesses are kept in niches in this mosque.
Different verses from Koran are carved on different walls of the mosque. A fascinating tower that is used to chant prayers is present inside the building.