Any idea what might correspond to Cragmaw Castle in the Shadowfell?

Any idea what might correspond to Cragmaw Castle in the Shadowfell? LMoP has taken a strange turn. a pristine version of the castle, where the tragic murder that marked its earliest days plays out again and again, unless someone can unmask the killer

— Mike Mearls (@mikemearls) June 11, 2018