Brutalist Doom is a WAD that retextures Doom to a have a Brutalist architecture. From Wikipedia:
"Brutalist architecture is a movement in architecture that flourished from the 1950s to the mid-1970s, descended from the modernist architectural movement of the early 20th century. Brutalism became popular with governmental and institutional clients. Examples are typically massive in character (even when not large), fortress-like, with a predominance of exposed concrete construction."
Critics of the style have described it as "cold-hearted", "inhuman", "hideous", and "monstrous", and for projecting an atmosphere of totalitarianism and urban decay. Brutalist Doom recreates this atmosphere, primarily through the use of a replacement TEXTURE1 resource, but also with a custom dehacked patch, texture replacements and a custom palette.