The Jan waterfall has been a mystery baffling scientists for centuries and years, as no one knows the source of the huge amounts of water flowing in it, but in 1928 the water of the springs was dyed in a stream 15 kilometers away in the valley of "Les Moritz", and after eleven days the dyed water appeared Suddenly at John's Waterfall, the mystery of the water source is solved. This waterfall attracts tens of thousands of tourists every year, especially in the evening when the waterfall is lit with artificial lights placed behind it, and visitors sit in the restaurants adjacent to it in a romantic and relaxing environment.