In this picture taken on Tuesday, March 18, 2014, Iranians walk through Tehran’s old main bazaar, ahead of the Iranian New Year, or Nowruz, in downtown Tehran, Iran. Nowruz which means “New Day” in Persian, marks the first day of spring and the beginning of the year on the Iranian calendar, which occurs exactly on the Spring Equinox, and usually begins on March 21 or the previous or following day. (AP Photo/Ebrahim Noroozi)