walls made of red stone standing by the road to protect the roadside, against the background of a blue sky, visible road and bicyc

architecture backdrop background barrier bicycle blue bluff brick brown build closeup construction craggy erosion exterior fence fill filled gabion granite gray huge landscaping made masonry material outdoor path pavement pile poles protect protection protective red retaining road roadside rock rocky rough security shaft sky slate stacked standing stone stones structure stuffed surface texture visible wall walls