At least once in each Muslim's lifetime, they must attempt a visit to the Holy Places of Islam located in Mecca, Saudi Arabia. The focus of this journey is the Kaaba, a small rectangular building around which a huge mosque has been built. This pilgrimage, known as the Hajj, begins two months after Ramadan each year. Dressed in symbolically simple clothing, Muslim pilgrims circle the Kaaba seven times, often followed by a drink from the Zamzam Well. Next, a symbolic search for water is performed by travelling back and forth between two nearby peaks. On the eighth day of the month, the pilgrims travel to Mina in the desert and spend the night in tents. The following day, over two million Muslims gather on the slopes of Mount Arafat, where the afternoon is spent in prayer. The Feast of Sacrifice, celebrated by Muslims worldwide, is performed by pilgrims in Mina the next day, and includes the slaughter of an animal. Finally, the pilgrims perform a ritual Stoning of the Devil by tossing pebbles at three pillars. Classic Islamic law details the manner in which the pilgrim dresses, behaves, arrives, departs and performs each of these rituals.