The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI has no name
POI types: building
OSM data version: 2017-07-28T09:42:02Z
#mapsme

"Мраморная пещера"
POI name: Мраморная
POI types: natural-cave_entrance
OSM data version: 2017-07-28T09:42:02Z
#mapsme