Bloodshot, on 17 November 2013 - 06:21 PM, said:
Fox, on 17 November 2013 - 11:21 PM, said:
There's Dark Forces, which has at least as large a dynamic in terms of scale as Duke 3D and contains more vertical level design than perhaps any other game of its era.
I also consider it even more varied than Duke, since every level takes place in a different environment with a different colour scheme (while still preserving thematic consistency).
Doom does have its fair share of open areas and themed locations, though they're not as realistically portrayed as in D3D or DF.