I don't think you can edit polls... sorry!
But I picked Tower of the Gods... for a few reasons.
It's not a dungeon that's evil, as it is more of a heroic test not controlled by Ganondorf.
Also, the boss, Godhan the Decider was quite fun ^_^
Finally, it is right before my favorite twist/revelation in any game I have played... yeah you know what I mean, people who have beaten the game... *tries not to give a spoiler*