1) Ancient city protectors 2) Chamber quartet 3) Cubicle creators 4) Jericho feature 5) Jericho features 6) Labyrinth parts 7) Landscape structures 8) Maze blocks 9) Maze parts 10) Mime barriers 11) Partitions 12) Place to find studs 13) Places for murals 14) Places for plaque buildup 15) Places for plaques Found on https://www.crosswordclues.com/clue/walls
Walls are an important and perhaps undervalued habitat for native plants. The most important walls are dry stone walls or old walls with lime mortar rather than cement. Several of our native ferns are more commonly found on walls than in their natural habitat, on limestone cliffs. For example Asplenium ruta-muraria, A. trichomanes, A. adiantum-nigr... Found on http://www.botanicalkeys.co.uk/flora/content/glossary.html