Sitting just off the north coast of Scotland, between the Atlantic and the North Sea, Orkney is probably the only place where, in the space of a single day, you can walk along a golden beach with seabirds and seals, clamber over wartime ruins, descend into ancient tombs or wander around a house that is older than the Pyramids. With rugged cliffs, rolling waves, prehistoric sites and stunning wildlife, Orkney is a wonderful place to go for a walk. This guide of 40 walks will help you make the most of it.