Yemenis gather at the historic 12th century citadel of al-Qahira in Yemen's third city of Taez, on July 21, 2021, during the celebrations of the Muslim holiday of Eid al-Adha. - Known as the "big" festival, Eid al-Adha (the Festival of Sacrifice) is celebrated throughout the Muslim world as a commemoration of Abraham's willingness to sacrifice his son for God, and cows, camels, goats and sheep are traditionally slaughtered on the holiest day. (Photo by AHMAD AL-BASHA / AFP)