Arches national Park blue sky canyon. colorado erosion landforms park avenue red rocks summer trail usa Utah valley countryside England english field footpath Great Britain green hedge kent landscape meadow nature path spring track view grass leisure rural shadow sunlight Surrey travel trees autumn barren clouds direction Fife future grey moor moorland overcast road scotland upland arrow brown dappled directions forest pine route sunny tree trunk trunks wood wooded woodland houses sky branches fence straight Sussex winter conifers edge natural pines Pinus bridleway exercise walk village deciduous farm