One of the most ancient megalithic constructions of the world is Zorats Karer (Syunik district) not reaching up to Sisian. From the line on a burnt plain row of huge red-brown monoliths are visible. The two-meter pointed blocks last precisely from the south to the north, fencing large territory, in the center they form a correct circle.
It is proved, that Zorats Karer is an observatory built in VI mil. B.C. Scientists have found similar constructions in many areas of Europe. The most known of them is the Stonehenge (II mil. B.C.).