A masonry unit for constructing built structures includes a rectangular shaped base having a front edge and a rear edge. The front edge and the rear edge each include a recess formed therein configured for disposal of a vertically disposed reinforcing material. A pair of spaced apart sidewalls extends perpendicularly from the base and along a length of the base. The sidewalls and the base together define a cavity configured for disposal of a fill material. A pair of spaced apart bridges is supported on the base configured for disposal of lengths of a horizontally disposed reinforcing material. The bridges extend transversely between the sidewalls and each have a height less than a height of the sidewalls. The base defines a hole therethrough disposed adjacent one bridge of the pair of spaced apart bridges.