aerial view towards the piani della greina, at the passo della greina, a mountain pass on the swiss alps in blenio

blenio ghirone greina motterascio scaletta ticino adventure aerial alpine alps altitude blue canyon cliff cold day drone europe fresh glacier gorge grass green heaven high hike hiking hill hut landscape majestic mount mountain mountains national natural nature nobody north outdoor outdoors panorama panoramic park peak range remote ridge river rock rocks rocky scenic stream summer summit sun sunlight sunny swiss switzerland top trail tranquil trekking valley view water wilderness