The Block House.

The block house was a safety house. It was the place that families went to in times of trouble. Sometimes these blockhouses stood alone, and some of them were part of a fortification.
You will note that the top floor is larger than the lower floor, this is because there are holes in the floor to shoot through which overlook the walls of the ground floor. Anyone trying to set fire to the walls could be shot from above.

Inside view of the blockhouse as part of a fortification.