the.com/halls of power

means The informal centers of governmental or institutional authority — the actual corridors and offices where influential people make decisions, as opposed to the formal, public machinery of politics.

from Not a single coinage but a natural metaphor built from two old words: 'hall,' which once meant a lord's great meeting-room — the literal architecture of medieval authority — and 'power' in its political sense. The phrase gathers strength from a long tradition of using physical architecture (chambers, thrones, courts, corridors) to stand in for abstract authority; 'corridors of power' is its close, slightly older cousin, popularized by a mid-20th-century novelist describing the hidden networks of Whitehall officialdom. 'Halls of power' drifts from that same vein — real buildings lending their stone and shadow to describe invisible influence.