algae beach coast Great Britain green natural nature Pembrokeshire plants pool rock sand sea seaweed shore united kingdom wales water welsh bank cloud direction gray grey hill landscape lane road rural storm straight travel trees woodland auk beak bird cliff edge feet Fratercula arctica puffin Skomer Island webbed wings animals Balanus barnacles creature crustacea marine Mollusca mussels Myrtilus rocks sealife Brecon Beacons changeable fey fickle hills lake moor mountains panorama route shadow sky stormy sunlight view bay calm hamlet hillside peace promontory uk village Worm's Head autumn distance distant Gower heath lonely moorland path track trail wander architecture carved christian church circle circular decorative elements glass ornamental religion religious rose round spokes stone stonemasonry wall wheel window