The Ben Ezra Synagogue is one of the oldest and most important synagogues in Cairo, Egypt. It was built in the 8th century CE, and is one of the few synagogues in the world that has been in continuous use since its construction. The synagogue is located in the Old City of Cairo, and is a popular tourist destination. The synagogue is also an important site for the study of Egyptian Jewry, and has been the subject of many archaeological excavations.