Hirilondë - the most creative thing in that was the size... dismissed.
Mordor - anything Sauron "created" was a mock image of the real artistry of creation... twisted imitations, so nothing original. Dismissed.
The Golden Hall - doesn't even come near... dismissed.
Formenos - a great triumph of creativity (the fortress) where a lot of talent lived. A good one.
The Undying lands - A lot of the same as with Formenos, but with larger scale. A very good one.
But as no one rfeally put themselves into arguing anything the winner is
++ Sinking of Numénor
Just for the entertainment value of the idea of that being Eru's most imaginative idea of how to get rid of the too self-confident and vain Numénorians...
and you know what the liberalists talk nowadays about the "creative destruction"! To the point!
