I must admit that i took a very good look at Bioshock, its a rather inspiring game to look at. And there is so much more. Its called doing your homework, if a map has to look like something than study that something.
Making a architectural map is like making a design, study, make sketches, try parts out, and don't hesitate to erase parts that don't fit.
In real life i make adverts and do marketing-work and such for the seccond largest newspaper in the Netherlands and some free-lance work for some smaller magazines, i also like to make 3d-cgi and still do the occasional illustration. So there you have it, a bit of my background ^___^
Other intrests are Japan (hence the map-names), i have been there several times now, this goes with manga and anime off course. And then there is still retro computing, especially the Sinclair computers and Sam Coupe.