The mountain range Sunduki or Chests is one of the most mysterious places in Khakassia. It stretches in the Shirinsky and Ordzhonikidzevsky districts, not far from the village of Iyus. An array of five separate outlier mountains, up to 200 m high, combining burial grounds, rock paintings and special structures, which, all together, according to some archaeologists, were used by ancient people to observe the stars, the sun and the moon.