Very atmospherics places with mystery around the unknown civilisation ... Who were (are?) these so called "Guardians"? Why Thargoids are going mad when find guardian-tech on board of ship? ... many questions, no answers yet ... but we will get them some day
Originally players needed visually locate these places ... CRAZINESS, but like many things also this was in time modified and now you can "find" these ruins when your ship get closer as 1k ls far from planet (below 1k it is now automatically detected and added as persistent POI). In Q1 update (impatiently waiting ) there are added to galactic map filters which allow "mark" all systems with known ruins.