Muslims consider the Kaaba—a small sanctuary near the center of the Great Mosque in Mecca— to be the most sacred spot on earth. Muslim legend teaches that the ancient religious patriarchs Abraham and Ishmael built the shrine using foundations first laid by Adam. Muslims all over the world orient themselves toward the Kaaba while praying, and every able Muslim is expected to make a pilgrimage to the Kaaba at least once in his or her lifetime. This picture shows pilgrimage ceremonies, which consist of several days of rituals and festivals during the Islamic month of pilgrimages, Dhu al-Hijja.