little stone house on the islet of the palu lake below piz palu glacier in swiss alps

alp alpine alps autumn beautiful below bernina blue canton clear clouds conifer day express famous forest glacier golden graubuenden graubunden grisons gruem grum house islet lake landmark landscape larch little mountain mountains natural nature outdoor palu palue panorama panoramic park peak piz poschiavo reservoir rock rocky scenery snow stone summer sunny swiss switzerland tourism tranquil tree trekking turquoise valley