The Hajj, the fifth pillar of Islam and one of the largest religious pilgrimages in the world, is currently taking place in Mecca, Saudi Arabia. Starting last Friday and continuing through Wednesday, some 3 million Muslims from around the globe are participating in several rituals, including the Tawaf -- the circumambulation of the Kaaba, the enormous cube-shaped building in the center of the Masjid al-Haram mosque. The pilgrims are are also taking part in the Sa'i, traveling back and forth between the mountains of Al-Safa and Al-Marwah, and Ramy al-Jamarat, in which they throw pebbles at three walls in the city of Mina to show their defiance of the Devil. Directly after the Hajj, Muslims all over the world will observe Eid al-Adha, or the Festival of Sacrifice. The feast honors Abraham who, according to Muslim tradition, was prepared to sacrifice his son Ishmael before God sent a ram in his place. To commemorate this event, worshippers sacrifice sheep, cows, and camels, and share the meat among family, neighbors, and the needy. Collected here are scenes of this year's Hajj and Eid al-Adha, from Mecca and around the globe.