54.2824°N, 3.2740°W.
Swinside Stone Circle, also called Sunkenkirk, sits in a remote sheep pasture under the bulk of Black Combe in southern Cumbria, England, one of the most complete and least visited stone circles in the British Isles. It is conventionally dated to around 3000 BCE in the late Neolithic and consists of about 55 standing stones of local grey slate set close together in a near-perfect ring 28.6 metres across, with two outlying portal stones marking a clear entrance to the southeast. Local folklore claims the stones were laid by churchbuilders each day and pulled down each night by the devil, which is the source of the Sunkenkirk name and dates back at least to the 18th-century parish records. A small antiquarian excavation by C. W. Dymond in 1901 found nothing but a charcoal layer, and the site has never been formally re-excavated since. Stone-against-stone, Swinside is the most architecturally tight of any of the great Cumbrian rings.
Reaching Swinside Stone Circle still requires a 90-minute walk up a farm track from the nearest public road, which is part of why it survives in the condition it does.