This is an ongoing dig in Uzbekistan - Karakalpakistan. These "things" are called KALA. It means "may it stand (for a long time)", "may it be (eternal)" in Turkic. This sentence also becomes a noun in Turkic meaning "the thing that shall stay" It also means "castle"
Build around 400BC.
Before the dig started:
Some tamgas have been found inside:
A picture inside the kala
These are thought to be Indo-Europeans.
It is widely accepted that Turks came here from the North Pole. It is accepted that Turks grew so much in number that they poured out of the North Pole, migrated all around Asia and assimilated the Indo-Europeans into being Turks.