Craters were never so exciting...

Engineers and astronomers are now discussing where the best location would actually be for a lunar base, and the idea of "inside a crater" has turned out to be at the top of the list. Specifically, at the south pole and perhaps even near Shakleton Crater.

Here in Chris Butler's image entitled, "City Limits", the form of the base is in a crater. People LOVE speculating on how this might happen. See Lunar Architects for more.