Almost to the end - 2017 short fiction in review, No. 9:
Which story was "Milady Wakes” which was published in Theme of Absence in, September 2017.
The core of this story is the assertion there's a castle in the British Isles which is so rambling that no one has ever been able to match up the number of windows seen from the inside with the number of windows seen from the outside. I've read that people have even tried to hang towels out the windows, but have been stopped by the proprietors as being too disruptive.
If this is indeed the case, could there be a secret room - and what could the secret be?
It's about time travel done the non-conventional way.