More than 2 million Muslims have begun the annual Haj pilgrimage in Saudi Arabia From first light Sunday, throngs of the faithful have circled the cube-shaped Kaaba in Makkah, one of the holiest sites in Islam. The Kaaba represents the metaphorical house of God and the oneness of God. Observant Muslims around the world face toward the Kaaba during their five daily prayers. The five-day pilgrimage represents one of the five pillars of Islam and is required of all able-bodied Muslims once in their life.