Close-up of stones at Metsamor in Armenia

They are part of a stone row leading to the museum

From the Megalithic Portal site
The Metsamor bronze-age (roughly 4,000 to 3,000 BCE) archaeological complex comprises several rows of menhirs (Vischaps), a bronze-age settlement and cup & ring stones. It is interpreted as an observatory.
Further evidence of power
The site is close to Armenia´s only nuclear power plant.
According to this site
http://www.armeniapast.com/prehistory/metsamor/ the stones in the row were brought from all over, their original positions and/or purpose isn't known though the modern interpretation is pretty clear.
The single menhir is dubbed a dragon stone (vishap)

Vishap stones, or dragon stones, are among the most important monuments of Armenian prehistory, for they are fish shaped stones sometimes with a fish’s eye and flippers carved on them, though sometimes sacrificed bulls are engraved on them. They are associated with water and were often erected in at the sources of natural and artificial lakes and springs.