This week's UNESCO World Heritage Site is located in the country of Turkmenistan. The Parthian Fortresses of Nisa are the remains of two fortresses that date back to the Parthian Empire, which ruled the area from the middle of the 3rd century BC to the 3rd century AD. The Parthians competed with the Roman Empire, providing a barrier to expansion that they were never able to defeat. Nisa was their capital city. The two fortresses contained in the UNESCO World Heritage site date from different time periods, and are called Old Nisa and New Nisa. The UNESCO World Heritage website says that Nisa was chosen to receive the World Heritage Site designation because "the archaeological remains vividly illustrate the significant interaction of cultural influences from central Asia and from the M

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