the territory that an ancient highly developed civilization left, traces of vital activity, remnants after the departure of an alien civilization, triangle alien’s spaceships, landing, after many centuries, a trace from the landing of a spaceship, a space base

the territory that an ancient highly developed civilization left, traces of vital activity, remnants after the departure of an alien civilization, landing, after many centuries, a trace from the landing of a spaceship, a space base, triangles spaceships