Shia Muslims make their way on foot en route to the Husayn Mosque in Karbala, about 270 kilometers northwest, for the Arba'een religious observance September 7, 2022 in Nasiriyah, Iraq. Millions make the annual journey to commemorate the martyrdom of the grandson of the Islamic prophet Muhammad and the third Shia Muslim Imam, Husayn ibn Ali in 680 AD. (Photo by Majid Saeedi/Getty Images)
