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Muslim pilgrims gather on the Plain of Arafat, outside Mecca, Saudi Arabia, on Nov. 15. The Hajj pilgrimage draws 2.5 million visitors each year, making it the largest annual gathering of people in the world. Mohammed Salem/Reuters
A Muslim pilgrim looks out of a bus window on the Plain of Arafat, outside Mecca, Saudi Arabia, on Nov. 15. Mohammed Salem/Reuters
Thousands of tents housing Muslim pilgrims are crowded together in Mina near Mecca, Saudi Arabia, on Nov. 14. Hassan Ammar/AP
Muslim pilgrims wash themselves in preparation for noon prayer near Mecca, Saudi Arabia, on Nov. 14. Hassan Ammar/AP
Muslim pilgrims head to the Grand Mosque by pick-up truck for noon prayer in Mecca, Saudi Arabia, on Nov. 13. Hassan Ammar/AP
Muslim pilgrims pray the noon prayer in Mina near Mecca, Saudi Arabia, on Nov. 14. Hassan Ammar/AP
Muslim women pilgrims are on their way to noon prayer in Mina near Mecca, Saudi Arabia, on Nov. 14. Hassan Ammar/AP
A Muslim pilgrim prays on a rocky hill called the Mountain of Mercy on the Plain of Arafat near Mecca, Saudi Arabia, on Nov. 15. Hassan Ammar/AP
A Muslim pilgrim is helped onto the Mountain of Mercy on the Plain of Arafat outside Mecca, Saudi Arabia, on Nov. 14. Mohammed Salem/Reuters
Muslim pilgrims pray on the Mountain of Mercy on the Plain of Arafat near Mecca, Saudi Arabia, on Nov. 15. Hassan Ammar/AP
A Muslim pilgrim reads the Koran on the Mountain of Mercy on the Plain of Arafat, outside Mecca, on Nov. 15. Mohammed Salem/Reuters
Tens of thousands of Muslim pilgrims move around the Kaaba, the black cube at center, inside the Grand Mosque, during the annual Hajj in Mecca, Saudi Arabia, on Nov. 13. Hassan Ammar/AP
Muslim pilgrims circle the Kaaba inside the Grand Mosque during the annual Hajj in Mecca, Saudi Arabia, on Nov. 13. Hassan Ammar/AP
Muslim pilgrims reach out to touch the Kaaba inside the Grand Mosque during the annual Hajj in Mecca, Saudi Arabia, on Nov. 13. Hassan Ammar/AP
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Although an economic boon, tourism can be a destructive force for the environment. Israel, filled with religious tourism destinations, is exploring ways to make pilgrimages sustainable.
This week Jerusalem hosted its first green pilgrimage symposium, tapping the fledgling but growing interest in promoting local communities and environmental sustainability through religious tourism.
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