The Tepe Sialk ziggurat is known to be the earliest culture in Iran, and the Siyalk culture found in the north-central part of that land at Tepe Siyalk near Kashan and Chashmah Ali near Teheran. The Siyalk culture is the earliest known culture of the pre-Halaf cultures of northern Mesopotamia and Syria. The area around this site has been dated back to 7500 BC and the temple base structure has been preliminarily dated to around 3000 BC. The structure of the Tepe Sialk structure or (ziggurat) is very similar to the more recent structures built in southern Mesopotamia. To know more about Tepe Sialk ziggurat please visit Explore Traveler.