In Frozen Elsa, the Queen of Arendelle, flees her kingdom after accidentally using her hidden frost powers. She runs off to the mountains and, in a spectacularly animated sequence, raises a clockwork ice castle into the skies. As I was watching I couldn't help but think of another clockwork fortress erected by another powerful being who fled his people: Dr. Manhattan in Watchmen.
I wasn't alone in noting the similarities; I forgot all about it until Drew Pearce, screenwriter of Iron Man Three, noted:
I love it.