This type of retaining wall uses man-made, interlocking blocks of concrete, stone, or cement to build a relatively strong wall. They can be used for small or large retaining walls and are available in a variety of colors and styles to create a variety of looks. This retaining wall delivers astonishing design versatility without complicated installation. This unique, solid-unit system is without equal. Marvelous curves, corners, stairs, freestanding walls, columns, and tall walls all are easily constructed using Interlocking block.