I am suggesting 3 novels which employ multiperspectivity. I am not sure if that meets the "Unusual Viewpoint" criteria, but I am not at all into books from the fringes having a strong woke, tribal, activist, etc. type alternative view as their predominant theme. So novels structured with multiple narrations is the only alternative I could think of
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The following 3 novels tell their stories from the points of view of multiple narrators or have multiple characters who have parallel experiences:
The Sound and the Fury - William Faulkner
https://en.wikipedia.org/wiki/The_Sound_and_the_Fury
The Emigrants - W G Sebald
https://en.wikipedia.org/wiki/The_Em..._(Sebald_novel)
The Woman in White - Wilkie Collins
https://en.wikipedia.org/wiki/The_Woman_in_White_(novel)
The
Woman in White is probably best described as being popular literature rather than serious, the literature tag (if earned) gained from its place in the history of the development of mystery novels.