Buildings and structures in Karachay-Cherkessia

thumb|upright|One of the conical secondary reflectors of the RATAN-600 on a 1987 USSR [[postal stamp ]]

astronomical observatory near Nizhny Arkhyz, Russia

thumb|255x255px|Fortifications of the Khumarin settlement by Bidjiev H. H.Khumarinskoye gorodishche (Russian: Хумаринское городище) or Khumar is a ruined medieval fortress on the top of Mount Kalezh above the Kuban Gorge in the Greater Caucasus, near Khumara village, Karachaevsky district, Karachay–Cherkessia, Russia.