I've spent four days of my summer walking in the norwegian mountains of Jotunheimen. With heavy rucksacks on our backs, camping in our tent or sleeping in cabins along the way: at The Norwegian Trekking Association's (DNT) cabins. You just bring your DNT key, and lock yourself in. It's a wonderful concept!
Just follow the T's! It will lead you to a cabin or someplace safe.
First photo by Christina Skreiberg & the second one by Joachim Sandvik