[Huinesoron]

Elostirion is correct, and no, 'third' pointed to the letter; straight clue is that the foundations were made with the One Ring.

T - If you want to play, shortly pay in what sounds like a dour, frozen world with a different note.
ORTHANC - Alternately, it's ok, thank the Sea for the toothed summit.
WEATHERTOP - It doesn't matter... or bottom, don't light any fires.
ELOSTIRION - If you hear a greeting (or more than one) before the Elvish city, look to the west.
BARAD-DUR - It's bad, but you need Marie's bane inside - duh, pretty much. Take a third of what one founded.

hS