Throwing stones at the pillars:
For those performing Hajj, the day is known as yawm-ul hajj al-akbar (The big hajj day) and is probably the longest day of the pilgrimage, and the most dangerous.The 10th of Dhul-Hijjah is Eid al-Adha, a day celebrated by Muslims around the world as the greater of the two Muslim holidays.
Pilgrims start the day in Muzdalifah and begin heading back to Mina before dawn. Once in Mina, they perform the first rami, throwing seven pebbles at the largest of three columns known as Jamarat. Pilgrims thus must slaughter a sheep, goat, cow or camel - or more likely, pay for it to be done in their names. At this point, pilgrims trim or shave (men only) their hair and remove their ihram clothes. Many will then proceed to Mecca to perform tawaf and sa'ee, first circling the Kaaba seven times, then walking seven times between the hills of Safa and Marwa. When all is finally done, they return to their campsite in Mina.
Final Days in Mina:
On each day, they will again symbolically stone the devil - this time throwing seven pebbles at each of the three pillars.With the hardest part behind them, pilgrims will now spend the next two or three days in Mina. When their time in Mina is finished, the pilgrims return to Mecca to perform the final circulation of the Kaaba, a "farewell" tawaf. Before heading home, many also go to Medina, the second holiest city in Islam, where the Prophet Muhammad is buried along with his closest companions. Visiting Medina, however, is not part of the pilgrimage.