Adhai Din Ka Jhonpra is a relic of an old mosque. Its beautifully carved pillars, arched screen and ruined minarets make it one of the masterpieces of ancient architecture. it was constructed in two and a half days, hence called as Adhai-Din (two and a half days).

 It was 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. Adhai-Din Ka-Jhonpra

is supported by 124 pillars all uniquely carved portraying Hindu and Jain architecture, while the monument is crowned with 10 splendorous domes.