Located centrally, the citadel (or Arg in Persian) was built in the 18th century by the founder of the Zand dynasty, Karim Khan. Having made Shiraz his capital, the citadel was one of Karim Khan’s many ambitious construction projects in the city. Lofty and rectangular, the fortress features four circular towers (which were historically used as prisons), and is more unusual on the inside than the outside. Once inside, you can appreciate the shade of the many citrus trees and the gentle trickling of the central pool, before exploring the well-put-together museum of the Zand period.