Join Do it yourself & save! Using natural stone for retaining walls, patios, & walkways is a great way to bring a natural look to your landscape. In this seminar you will learn about the various types of natural stone & how to plan, layout, & construct natural stone retaining walls, patios, & walkways. The flagstone paths & walkways segment is at 10am, the dry stack retaining walls segment is at 11:30am.