"It was built around 1923 by a local farmer who wanted to teach young people how to swim. There were streams of geothermal water flowing from the mountains and the guys used it to fill the pool, it's all natural," an old Viking king of guy told me as we were enjoying the warm water and the views around and went on: "The first time I swam in the pool was over 30 years ago and over the years I used to work on this place. You're very lucky because if you came tomorrow, the pool would be empty. Later today people will come to clean it. They only do this once a year and you just came right before they do it, so we're the last guys to swim here for a few weeks..."