there is a gentleness to these homes, their inhabitants are connected to the earth. they are worn, softened, and cozy. warm, too. also, i believe that one of these could be built by a couple who is starting out in life together.
while these buildings look like they've been abandoned, the article i lifted the picture from here discusses earth roofs and their advantanges. the yurts, on the other hand, have the advantage of being temporary structures and thus less restricted by building codes and property taxes.