BfA is the first expansion since TBC to not reuse or revamp an old dungeon or raid

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Barring any unannounced patch content of course:Legion had Violet Hold and Karazhan.WoD had UBRS.MoP had Scarlet Halls, Scarlet Monastery and Scholo.Cata had Deadmines, Shadowfang Keep, Zul'gurub and Zul'aman.WotLK had Naxx and Onyxia.Just a mildly intersting showerthought.