Every Muslim whose health and finances permit it must make at least one visit to the holy city of Mecca, in present-day Saudi Arabia. The Ka’ba, a cubical structure covered in black embroidered hangings, is at the center of the Haram Mosque in Mecca. Muslims believe that it is the house Abraham (Ibrahim in Arabic) built for God, and face in its direction (qibla) when they pray. Since the time of the Prophet Muhammad, believers from all over the world have gathered around the Ka’ba in Mecca on the eighth and twelfth days of the final month of the Islamic calendar.