Old Nisa is a large complex of ruins in the southern part of the city of Nisa, which is located 18 kilometers west of the center of Ashgabat. Archaeologists assume that the city was founded in the third century BC. Nisa was part of the Parthian Empire, and at that time it was called Parthaunisa. It was a very important settlement in the empire, so many scholars believe that some rulers ruled from Nisa, but this claim is unconfirmed. The city has been destroyed in an earthquake that occurred in the first decade of BC. UNESCO placed the city's ruins on the World Heritage Sites list in 2007.