The cave can only be visited with a guide and there is an entrance fee (children NOK 150, adults NOK 200). During our visit (July 2023) only young people were involved in ticket sales and as guides. The cave is worth visiting, although our young guide seemed very disinterested and uncommitted. Opening times vary seasonally, see gronligrotta.no
The Grønligrotta about 20 kilometers north of Mo i Rana is an illuminated marble cave that can be visited as part of a guided tour. Tours always start on the hour, the guides speak Norwegian and English.