Beyond the Dargah of Khwaja Muin-ud-din Chishti, on the town outskirts, are the extraordinary ruins of the Adhai-din-ka-Jhonpra mosque. According to legend, construction in 1153 took only 2½ days. Others say it was named after a festival lasting 2½ days. It was originally built as a Sanskrit college, but in 1198 Mohammed of Ghori seized Ajmer and converted the building into a mosque by adding a seven-arched wall covered with Islamic calligraphy in front of the pillared hall.
Although in need of restoration, it’s an exquisite piece of architecture, with soaring domes, pillars and a beautiful arched screen, largely built from pieces of Jain and Hindu temples.