Castlerigg Stone Circle, on the outskirts of Keswick, is very easily accessible. For this reason, and also due to its stunning beauty, it’s also the most visited stone circle in Cumbria. Castlerigg is one of the first stone circles to have been built in Britain, dating from around 3000 BC. Various theories have been put forward as to the circle’s purpose, ranging from a burial site to an astronomical observatory. What is for certain is that, despite its popularity, this is a remarkable place of peace and tranquillity.