A wall hanging system by which a wall décor item such as a ledge, a frame, artwork, or the like may be mounted to and hung from a wall. The wall hanging system may include a first mounting assembly that is coupled to the wall and a second mounting assembly that is coupled to the wall décor item. The first and second mounting assemblies may be engaged to mount the wall décor item from the wall. One of the first and second mounting assemblies may include a post and the other of the first and second mounting assemblies may include a cavity. The post may be inserted into an insertion portion of the cavity and then slid to a nesting portion of the cavity to lock the first mounting assembly to the second mounting assembly.