Serpent's Wall
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Serpent's Wall (Ukrainian: Змієві вали, Zmiyevi valy) is a landmark in the north of Ukraine, near the city of Kiev. It comprises ancient walls and more modern World War II fortifications.
The ancient walls were built between the second century BC and seventh century AD, according to carbon dating. What peoples built the walls is still unclear, but are supposedly ancestors of the Slavs. The purpose of the walls was evidently defence from the nomads of the southern steppes. The remaining ancient walls have a total length of 1,000 km.