bank of england bank square bank station buildings center historic horseman London monument old old town subway tube Underground black chock current danger dangerous electric electrical fence high installation net power sign station sundtech volt voltage warning yellow aerial aerials antenna antennas base basestation cell cellular equipment mast mobile mobiles pylon radio repeater sky stations telephone telephones alien deep space nine flying saucer galaxy lights milky way red ship space spacecraft spin star stars travel universe airport baggage car cars cart carts departure heavy luggage train station transport transportation trolley trolleys vacation waggon wagon weight arrow arrows decorative direction exit out pictogram pictograms signpost signs tile tiles tiling way way_out cells grid pole radiate radiation receiver steel transmitter concrete dundee geodetic Great Britain hill landmark law location marker pillar point scotland survey triangulation trig united kingdom viewpoint fuel gas generate global greenhouse industrial industry infrastructure landscape nuclear oil plant pollute pollution production smog smoke stack