In my opinion the best temple/dungeon/whatever is the Dark Hyrule Castle in TMC. (Hope it counts as a temple/dungeon.) It looked cool, I love that dark-green design; it had great music (I love TMC's musics, but the Dark Hyrule Castle is the best all of them), I enjoyed the whole temple/dungeon/whatever, and I didn't care it's long or hard, or other, because of the design and the music, I just enjoyed it. And the boss was AWESOME. 'Nuff said.

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Nayru Awards 09: Most Likely to be an Evil, Typing Cat
MISS NESI IS A DINNIE-NAYRULIAN HYBRID ~ Foxheart
Silly Nessie. Loch Ness Monsters don't even purr. :3 ~ Zero of Time
Nesi, based on your avy, you strike me as Astarael's little internet sister. ~ VictorZamora
Sorry but Nesi is the forum's cat ~ candc32