Winter in the northern hemisphere is going to be starting in a few short weeks. To kick off that event, here is a link to an article at io9 on how to build an igloo.
Most folks will remember that igloos are a winter shelter built by Eskimos.
The link in the io9 article is acting weird, so I provided a link to the beginning of the article from GORP
io9 - How to Build an Igloo for the Nuclear Winter
Encyclopædia Britannica - Eskimo (People)
GORP - Igloo Mania: The Joys of Igloo Making and Camping