aerial panorama view of the aletsch glacier, a unesco world heritage in valais, switzerland

panoramic pano drone disappearing melting summer global warming wallis overlook alps panorama alpine switzerland swiss heritage viewpoint trail ice aerial mountain view sky background snow glacier nature hiking outdoor travel landscape mountains climatic change cold icy park aletsch climate water adventure blue scenic maejelen macurren rjelensee maerjelensee trugberg platta geisshorn olmenhorn peaks unesco world valais