This is the same 1.27M-building, tile-streamed store the city map renders — entered at eye level. Buildings within ~500m of you stream in as you walk and are dropped again behind you, so the whole metro is walkable without the whole metro ever being loaded. Footprints and positions are real (Overture Maps: Google Open Buildings + Microsoft ML footprints + OpenStreetMap, merged); heights are honest measured from satellite imagery for 73% of the city, and estimated for the rest — press C to see exactly which is which, colored by confidence. The green beacon marks KICC.