Ordu-Baliq
Khotont, Mongolia
Ordu-Baliq (meaning "city of the court", "city of the army"), also known as Mubalik and Karabalghasun, was the capital of the Uyghur Khaganate. It was built on the site of the former Göktürk imperial capital, 27 km (17 mi) north-to-northwest of the later Mongol capital, Karakorum. Its ruins are known as Kharbalgas in Mongolian, which means "black ruins". They form part of the Orkhon Valley Cultural Landscape World Heritage Site.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).