Around two million Muslim pilgrims are in Mecca in Saudi Arabia for the annual Hajj – one of the five pillars of Islam.
By walking en masse seven times around the Kaaba – the cube dedicated to Allah – Muslims show their brotherhood and demonstrate that they are all equal in the eyes of Allah.
Another part of the pilgrimmage is to visit the nearby valley of Arafat and to gather rocks which are thrown at stone pillars at Mina which represent the devil.
It is considered the sacred duty of Muslims to undertake the Hajj once in their lifetime if they are able.
At the end of Hajj Muslims from all over the world celebrate the holiday known as the Eid ul Adha, the festival of the sacrifice.