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There is a post about this earlier in the thread already. The only way to enter these locations is to hex-edit the location of the party in a savegame. How it works? Save a game while you stand somewhere. Then move one step forward and save another game. Now in Dos prompt type at the prompt: fc /b XXX.gam XXX2.gam (or the XXX.gam should be your savegames).
Look at the hex adresses that show up. I don't remember anymore, but it could be that you need to use the try-and-error method with editing the games, as there might be many results.