The annual pilgrimage brings together millions of Muslims from all around the world, with no regard to social status, nationality and economic status.
Hajj, set to take place this September, is the one place spiritual devotion and commitment are demanded to the fullest.
Here's a round-up of the most beautiful photos of pilgrims performing hajj over hundreds of years:
1. Dating all the way back to 1907
2. To more recent times in 2008
3. The Plains of Arafat on the day of hajj are crowded with devout pilgrims
4. Just look at all those people...
5. All dressed in black and white
6. Praying together as one
7. All day...
8. And all night
