active altitude Andes crater giant green lake midday nature Quilotoa sky steep view volcano water antarctica cold frozen icy lanscape mountain polar Ross Sea sea snow South Pole clouds cloudy downhill landscape new zealand Ruapehu ski skiing snowy sport sveres turoa blue boats cityscape cruise cruiseship Greece holiday island Med mediterranean ocean santorini vacation white bath bath house bathing building column columns eruption Italy Pompeii public ruin ruins Vesuvius wall walls ash cone national monument St Helens tree usa Washington State wasteland corrosion trees America chile climbing high mountaineering mountains peak south top tourism travel