The Swedish Ice Hotel

Click on the above title to watch a YouTube video about the annual Swedish Ice Hotel.  It might take a couple of minutes for the video to start, but it will play.  By "annual" I mean they have to build it every year and it only lasts 4 to 5 months.  Then after that it melts and the water is returned to the river.  If you want to do something totally different and don't mind the cold, this could be what you have been looking for?