Zanjan, Zanjan Province, Iran

Hosseinieh Azam Zanjan

A major Shia mosque and hosseinieh complex completed in 1878, home to one of Iran's largest annual Ashura mourning gatherings, drawing crowds of over 500,000 on the 8th of Muharram. (en.wikipedia.org/wiki/Hosseinieh_Azam_Zanjan_Mosque)