This is still, very much, a work in progress, but now, you can actually play through ascii maps. I worked on passing the ascii layout to the javascript port of Richard Garriott's DND1.
So I made an ascii representation of the first dungeon in the D&D red box. And I can now pass that to the DND1 engine, and you can play it. I mean, it is not going to be the same experience. It does not implement a bunch of features that would need to be done to have static monster encounters, and scripted events and other things like that. But, maybe, one day, I will get around to enhancing it.
EDIT Also, this means you can go make your own maps. You can see the above map in the ascii to svg tool.

