Tus Citadel
Citadel from the Sassanid era in Iran / From Wikipedia, the free encyclopedia
The Citadel of Tus (Persian: ارگ توس Arg-e Tus) is a citadel from the Sassanid era, located in Tus, in Razavi Khorasan province of Iran.
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It is made of brick and is rectangular in shape, having four circular towers at each corner, with two more circular towers in the inner structure.[1] Not much remains of the structure; however, its size is comparable to other large citadels of the Sassanid era of Iran.