During Hajj, pilgrims join processions of millions of Muslim people, who simultaneously converge on Mecca for the week of the Hajj, and perform a series of pre-Islamic rituals (reformed by Muhammad): each person wears a single piece of unstitched white clothing (Ihram), walks counter-clockwise seven times around the Kaaba (a cube-shaped building and the direction of prayer for Muslims), kiss the black stone mounted on the...