A friend recently turned me on to this project... This Matsunoyama Natural Science Museum by Takaharu Tezuka＋Yui Tezuka is a spectacular clean lined structure built of Cor-Ten steel. Its designed to withstand the pressures of 4 meter snow banks, in order for the occupants to experience the depth and light beneath the snow. The use of nature, particularly snow, is an innovative and quite spectacular use of material. I've got to believe that its probably fairly energy in-efficient, but its a beautiful structure nonetheless.