Bayn al-Qasrayn (Arabic: بين القصرين, lit. 'between the two palaces') is the district and plaza between two former palace complexes constructed in the 10th century by the Fatimid dynasty in medieval Islamic Cairo, within present day Cairo, Egypt. It was an original element in the Fatimid Caliphate's plan for a new palace-city, named al-Qahirah (today's "Cairo"), and later became the site of many monumental buildings constructed in the Ayyubid, Mamluk, and Ottoman periods, even up to the 19th century. Many of these structures from different periods survive in the area today, located along what is now called al-Mu'izz Street.