Guardian_Structure is a surface site created by the Guardians_, a extinct nonhuman race which also needed dealt with Thargoids. And maybe they aren't completely extinct, there already exists hints that Guardians_AI could survive. Some of these places contain Databank; a source of special micromaterial (blueprint) needed for unlock either equipment or weapon build by the Guardian_ technology. Structure on screenshot is one with nicest views which I found so far, it is in system VELA DARK REGION DL-Y D112, planet 1 A.
Image above is overal view on Guardian_Structure which have activated all 6 energy pilars and also Databank. Databank animation can be seen in video below: