Tus citadel
From Infogalactic: the planetary knowledge core
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. Not much remains of the structure; however, its size is comparable to other large citadels of the Sassanid era of Iran.
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