On the other hand, outside Arctis Tor might work.
I'm thinking things like the royal palace in Stockholm, or the Kremlin, as in palaces in cold places. Presumably only palaces that are actually in use would count, though, pure touristy ones would probably redirect to sleeping beauty style castles instead.
As for the Mother's cottage, I think some parts of it could resonate more surprisingly; it's also a sort-of hidden in plain sight place with massive power over life and death, so something like a nuclear command center that few people know about could work (i.e. not NORAD, it's too well known).