A tough one! It's hard to decide what counts or doesn't count as a classic, but let me name a few that I would argue are pretty iconic...
The Bloody Chamber (short story collection), My Cousin Rachel (Gothic novel), Piranesi (a category of its own, has the makings of a modern classic)
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The Bloody Chamber (short story collection), My Cousin Rachel (Gothic novel), Piranesi (a category of its own, has the makings of a modern classic)