Now that Backrooms has been a hit, I wonder if we’ll ever get a House of Leaves movie, which was somewhat of an inspiration for the original backrooms lore.
In the meantime, claymation studio Laika has a faithful adaptation of "Piranesi" in the pipeline. It's more dreamlike and beautiful than gothic horror, but it does center on a similar concept of an infinite structure existing beyond physically reality that reflects human thought in enigmatic ways.