It is a ritual that is designed to promote the bonds of Islamic brotherhood and sisterhood by showing that everyone is equal in the eyes of Allah.

 
This year, the Hajj is expected to begin Monday and end Sept. 26.   This year it is taking place amid threats from Islamic State militants and following a giant crane collapse at Mecca's Grand Mosque that killed more than 100 people, BBC reported.

The five-day pilgrimage occurs in the month of Dhu al-Hijja - the 12th and final month of the Islamic lunar calendar.

It is a journey that every sane adult Muslim must undertake at least once in their lives if they can afford it and are physically able.