beach calm coastline dusk England english evening Great Britain groyne nature placid sea shore sunset Sussex water winter Cornish cornwall low mussels Mytilus natural rock rocky tide view cave cliff danger dark Pembrokeshire rocks united kingdom wales welsh blue boats dinghies dinghy gravel Seaford shingle white buildings coast hazard houses lighthouse norway norwegian ocean promontory town warning cloud colour heavy sandstone sandstones shadow sky stone boat holiday landscape Sardinia summer tourism tourist vacation Apulia clfftop forest Gargano Italy Puglia village bay harbour port safety