What's the Hajj, the Islamic pilgrimage, and why is it significant for Muslims?
Once a year, Muslim pilgrims flowing into Saudi Arabia unite in a series of religious rituals and acts of worship as they perform the Hajj, one of the pillars of Islam. As they fulfill a religious obligation, they immerse themselves in what can be a spiritual experience of a lifetime for them and a chance to seek God's forgiveness and the erasure of past sins.