Dry stone walls, as the name suggests, are stone-stacked walls made without the help of mortar or concrete. They're characteristic of the rolling greens of upland Britain, and in the back half of the 18th century they became a feature of the dairy farms around Kiama in New South Wales. These walls are slowly deteriorating and at risk of disappearing altogether as new landowners struggle to find the expertise to restore and maintain them. But a new push to save them is coming from across the ditch in New Zealand.