Yes, you were right about my hint.
Imladris in the only one not named after something or someone of the same name.
Other guesseses:
Minas Tirith because it isn't in close proximity to the Misty Mountains, or Fangorn, the only place where Men and Elves do not live. Also, Imladris is the only one on the Western side of the Misty Mountains.
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'They say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end."
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