Mirny Diamond Mine - Eastern Siberia, Russia The world's second largest man-made hole, Mirny was constructed by Stalin to satisfy the Soviet Union's demand for industrial diamond. Further digging efforts were eventually abandoned when it became too diffic
is early warning radar station of Soviet missile defense system located in Moskovskaya oblast, Russia. NATO’s code - "Cathouse". Today the station operates partly; most of the equipment was dismantled.