One of the best party ever, for snow and mountains lovers, happens yearly in Switzerland: a large and warm pool appears for a single night near Lac Lioson. During the day all the material and the wood necessary for the heating are brought up just with the legs of the wannabe bathers. After watching the sunset from a nearby top, skiing down, with or without clothes, from temperatures as low as -20°C to the 40°C pool, is magical. Among concerts and beers the party crazily goes on all the night until the Moon appears and call for a last before-bed ski-tour.
The guys at Jaccuzzi, many of whom engineers from the Swiss Federal Institute of Technology, organised many editions even more extreme, including one on top of Mont Blanc and another suspended in the void.