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There's been a lot of threads about the single best/favorite installments (chapters) of the APs, but what is in your opinion the single best dungeon - be it an actual dungeon, wizard tower, bad guy HQ or whatever - from any AP, and why?

There's a lot of threads about people's favorite AP, but I'm curious as to what adventure from each path is a favorite, and why.
By this I mean, I very often see Seven Days to the Grave mentioned as the best single adventure in Curse of the Crimson Throne. But why, and what about for all the rest of the APs that people has played?

Thanks.