 They include cairns, standing stones, bothies, distinctive rock formations, panoramas, views and natural features such as cascades and waterfalls.He also warns of problems to be aware of on more challenging paths (such as the "bad step" on the climb up to Crib Goch).He generally used a Leica for his photography, and gave details of his methods in the pocket guides, together with friendly advice on hillwalking and scrambling.