Craster's Keep

Craster's Keep is the grand name given to a small, fortified homestead, located several days' journey beyond the Wall. It is the abode of Craster, a wildling who lives there with his wives and daughters. Craster permits the use of the keep as a redoubt and resupply post by the Night's Watch in return for otherwise leaving him alone.

In the books
Craster's Keep is not a true keep, but instead a log hall surrounded by an earthen dike, also consisting of a sheepfold, pigsty and midden heap. The hall itself is quite large, large enough to accomodate a few dozen people at any one time.