Saudi Arabia is barring international visitors for the hajj. A scholar explains a long history of disease, politics and war that have previously prevented people from making the journey to Mecca.
Millions of Muslims will convene in Mecca, Saudi Arabia, on Aug. 9. The annual five-day pilgrimage, known as the hajj, is required of all Muslims who can physically and financially make the journey.
Each year, Muslims from all over the world go on a pilgrimage to the holy city of Mecca in Saudi Arabia, known as Hajj. A scholar explains its spiritual significance.