circular notches on the upper surface of the megaliths of the kamenny gorod tract devil`s fortified settlement

abstract aged air are break calm cave cavities circular clear color concrete cover dark deep devils dirty drain empty end exit filled floor fortified gorod gray grey grunge hole horizontal image infinity inside kamenny large light megaliths mystery notches open parasitically people photography pipe pipeline pit pool reflected reflection regular rock rough round settlement shape shining stone structure sunlight surface textured there top tract tunnel upper vintage water well wet