I of course feel very fortunate, not only as a co-designer of RM, but as one who has played under the masterful GM power of Pete Fenlon. The man could paint a picture, not only with his maps, but in the living game we played in. He created at least three great characters for me.
But I meant to ask here, what was the most interesting environment you have been in while you played? At UVa, we sometimes snuck into the engineering school, which had these multi-level grated rooms with huge machines (they could be sets for movies), and cool small rooms with blackboards we could use, which we did all weekend. But we also would have a few games at homes in Charlottesville, almost like the Shire in some neighborhoods.