Corten steel facing on a "traditional" retaining wall.
Steel and lumber retaining wall, modern design, reused elements. For a fence? I think I know a guy that can help...
Stamped Concrete Retaining Walls, Stamped Concrete Retaining Walls ... More
concrete sleeper retaining walls - Google Search
Cement retaining wall Looks Like Wood | retaining wall services | Apex Retaining Walls
Concrete sleeper retaining walls
Curved timber retaining wall with vertical railway sleepers, great against a lawn. Very low maintenance
Concrete Sleeper Retaining Wall