Nasir al-Mulk Mosque is often called the "Pink Mosque" thanks to its captivating, brightly colored tiles and stained-glass windows. Built in the late 19th century during the Qajar dynasty, Nasir al-Mulk still functions as a mosque as well as a tourist attraction. Visit in the morning, when the light filters through the stained-glass windows and casts mesmerizing shadows in the prayer hall.