The annual pilgrimage (Hajj) to Makkah is an obligation once in a lifetime for those who are physically and financially able to perform it.  About two million people go to Makkah each year from every corner of the globe.  Although Makkah is always filled with visitors, the annual Hajj is performed in the twelfth month of the Islamic calendar.  Male pilgrims wear special simple clothes which strip away distinctions of class and culture so that all stand equal before God.