In the five daily prayers Muslims face the Kaaba in Mecca, Saudi Arabia. It is a cube-shaped stone structure that was built by Prophet Abraham and his son Ishmael on the same foundations where Prophet Adam is believed to have built a sanctuary for the worship of the One God. Muslims do not worship the Kaaba. It serves as a focal point for Muslims around the world, unifying them in worship and symbolizing their common belief, spiritual focus and direction. Interestingly the inside of the Kaaba is empty.