Toprak Kala

Toprak-Kala, in modern Karakalpakstan, Uzbekistan, was an ancient palace city and the capital of in Chorasmia in the 2nd/3rd century CE, where wall paintings, coins and archives were discovered. Its history covers a period from the 1st to the 5th century CE. It is part of the "Fifty fortresses oasis" in modern-day Uzbekistan.

Source: Wikipedia