Special features are specific elements incorporated in a dry stone construction. A wallhead is such an example. It is simply where a wall begins or ends. It is similar to a singular pillar, however it is actually tied-in or built into the body of the wall. A curve, through-stones, stepped foundations, protruding foundations, linteled arches, steps, squeeze stiles, niches, seats, holes, aperatures, water smoots and bee boles are examples. A cairn or a sheep-fold for enclosing sheep are also unique special features.