Did 당신 spot the sneaky River Song callback in this week’s Doctor Who? 

And as some 팬 with particularly good memories may recall, one such visit has actually been chronicled in the series before, with the Doctor taking wife River Song there offscreen prior to the events of 2011 episode A Good Man Goes to War.
키워드: spot, the sneaky, river song, callback in this week’s, 닥터 후