My employer sent the project team where I am currently working in, to a teambuilding event. We went into the mountains of the "Allgäu", around 200 km south of Stuttgart. Our job was it to build an igloo -instructed by a scout- and sleep the night in it. The temperature outside was -12 °C (9 F), so it was a good idea to get the igloo done until the night falls. The igloo on the photo was "mine" (two persons per igloo) and sleeping in it was really an outstanding (and cold) experience.