bridge cantilever cross estuary Forth iconic metal rail river road suspension train water Lake Huron Lake Michigan lakes Mackinaw roadway suspension bridge towers traffic transportation barrier canal channel crossing railroad railway steel trains belt cable clouds Denmark driving great Nyberg passing pylon wire car cars drive over path street warsaw antique castle classic lazienki moat monument old palace park architectur bonn germany rhine sky structure alps architecture Austria holidays leutasch mountains nature seefeld tirol tourism travel walk left-hand traffic line London traffic jam bicycle cycle fence footprath lamppost pedestrian perspective Tay track