Using walls are an attractive way to delineate space and add a sense of structure to a backyard or front yard landscape. Low walls provide additional seating or a platform on which to display potted plants. Tame a slope with a terrace of Mortared-stone retaining walls offer long-lasting solutions to sloped yards--and offer beautiful surfaces and backdrops for plantings. If you want a dramatic and long-lasting entryway to your home or garden, try a stone wall.