The Kaaba in Mecca, Saudi Arabia is the holiest site in Islam. It was originally constructed by Abraham and Ishmael as a place of monotheistic worship. Over time, it housed pagan idols until Muhammad cleansed it of idolatry in the 7th century CE. Since then, it has undergone many renovations to accommodate growing numbers of pilgrims. Today, it remains a cubical structure draped in cloth and is the focal point for Muslims' five daily prayers and the hajj pilgrimage, one of the five pillars of Islam.