Rjukan is a small town located in the Gaustablikk region of Telemark, Norway. Situated in a valley surrounded by mountains, Rjukan is known for its stunning natural beauty and outdoor recreational opportunities. The town is famous for its industrial history, particularly for being the location of the Rjukan Falls, which was used to produce hydroelectric power for the nearby industrial facilities. Rjukan is also known for its unique sun mirror, which was installed to reflect sunlight down into the town square during the winter months when the valley is shaded by the surrounding mountains. This innovative solution allows residents and visitors to enjoy sunlight even during the darkest months of the year.