The Hajj Pilgrimage to Mecca

The Hajj ( Ḥaǧǧ) is a pilgrimage to Mecca (Makkah). It is the largest annual pilgrimage in the world, and is the fifth pillar of Islam, an obligation that must be carried out at least once in their lifetime by every able-bodied Muslim who can afford to do so. The Hajj is a demonstration of the solidarity of the Muslim people, and their submission to Allah. The pilgrimage occurs from the 8th to 12th day of Dhu al-Hijjah, the 12th month of the Islam. Because the Islamic calendar is a lunar calendar, eleven days shorter than the Gregorian calendar used in the Western world, the Gregorian date of the Hajj changes from year to year. In 2007, the Hajj was from December 17–21; in 2008 from December 6–10, and in 2009 will be November 25–29.
The Hajj is associated with the life of Muhammad from the 7th century, but the ritual of pilgrimage to Mecca is considered by Muslims to stretch back thousands of years to the time of Ibrahim (Abraham). Pilgrims join processions of hundreds of thousands of people, who simultaneously converge on Mecca for the week of the Hajj, and perform a series of rituals: Each person walks counter-clockwise seven times about the Kaaba, the cube-shaped building which acts as the Muslim direction of prayer; kisses the Black Stone in the corner of the Kaaba; runs back and forth between the hills of Al-Safa and Al-Marwah; drinks from the Zamzam Well; goes to the plains of Mount Arafat to stand in vigil; and throws stones in a ritual Stoning of the Devil. The pilgrims then shave their heads, perform a ritual of animal sacrifice, and celebrate the three day global festival of Eid al-Adha.
As of 2008, about three million pilgrims participate in this annual pilgrimage. Crowd-control techniques have become critical, and because of the large numbers of people, many of the rituals have become more stylized. It is not necessary to kiss the Black Stone, but merely to point at it on each circuit around the Kaaba. Throwing pebbles was done at large pillars, which for safety reasons in 2004 were changed to long walls with catch basins below to catch the stones. The slaughter of an animal can be done either personally, or by appointing someone else to do it, and so forth. Muslim historians refer to the time before Muhammad as Al-Jahiliyah, the "Days of Ignorance", during which the Kaaba contained hundreds of idols – totems of each of the tribes of the Arabian peninsula, with idols of pagan gods such as Hubal, Al-Lat, Uzza and Manat, and also some representing Jesus, and Mary.
Muhammad was known to regularly perform the Umrah, even before he began receiving revelations. Historically, Muslims would gather at various meeting points in other great cities, and then proceed en masse towards Mecca, in groups that could comprise tens of thousands of pilgrims. Two of the most famous meeting points were in Cairo and Damascus. In Cairo, the Sultan would stand atop a platform of the famous gate Bab Zuwayla, to officially watch the beginning of the annual pilgrimage.
In 632 AD, when Muhammad led his followers from Medina to Mecca, it was the first Hajj to be performed by Muslims alone, and the only Hajj ever performed by Muhammad. He cleansed the Kaaba, removed all of the idols, and re-ordained the building as the house of God. It was from this point that the Hajj became one of the Five Pillars of Islam.