According to the testimonies based on the profound studies conducted by Paris Heruni, a prominent physicist and engineer, doctor of technical sciences, professor and academician, Karahunj (also known as Zorac stones and Karenish) is a prehistoric megalithic structure, the ancient observatory in the world, historical and cultural reserve and a state protected structure. It is situated on a valley on the left bank of Vorotan river, which is near the town of Sisian in Syunik region of the RA at the height of 1170 m above the sea level and covers an area of 7 hectares.
The common name is Zorac stones, and the name Karahunj was proposed by an academician Paris Heruni, who studied the complex in the 1990s and the stone monument in accordance with the 2004 RA government decree and with the ratification of the president it was renamed into Karahunj (stonehenge) observatory.
At present, however, people call it Tsits stones (peg stones). There is no exact dating as regards the formation of Karahunj. Nonetheless, Paris Heruni in his “Ancient Armenia and Armenians” book estimated that Karahunj was approximately built over 7500 years ago and the estimation was processed by his own unique methods. It is noteworthy that the age of Stonehenge megalithic structure in Great Britain was also estimated with the same method, which is quite common among scientists.
Karahunj is composed of several groups of structures and separate stones that make up the megalithic monument of the complex, which includes the central circle, northern and southern wings, north-eastern road, and a cord crossing the circle and separately standing magnificent stones made of basalt with their height ranging from half to three meters and with their weight up to ten tons. Stones of Karahunj were brought from the nearby stone mine of Dar river canyon. They were raised and moved through by means of the woven ropes and yoked animals and holes were opened in the rocks of the observatory and astronomical instruments were prepared there.
The central circle is made up of 40 stones, which are oval with sharp edges. There is a pile of ruins in the center, in place of which there was allegedly a religious temple. It is quite interesting, that the same proportions and symmetry were also preserved in Garni Temple. There are respectively 80 and 70 roads made of separately paved stones with holes in most of them in the northern and southern wings of Karahunj. The same can also be found in the north-eastern wing. The cord crosses the central circle and as a continuation of the northern wing, it adjoins it with the southern wing. It covers 20 stone, 6 of which have holes.
There are separately standing stones in various parts of the monument, which are located at the distance of 90 meters or more in the eastern and western sides. The stones were presumably used for certain aims as were probably the stones of Stonehenge. The holes in the stones of the ancient monument are of unique nature and provide high accuracy and stability aimed at reaching the destination. The two holes are widened in a cone-shaped form and made with tools prepared from tempered clay and obsidian cores. The surface is clean and polished from inside.