Ah! Cerin Amroth! I LOVE the description of Frodo's experiences climbing the hill with Haldir, his awareness of the life within the tree, his vision of the world from the top of the flet, and then his beautiful encounter with Aragorn after coming down from the tree:
At the hill's foot Frodo found Aragorn, standing still and silent as a tree; but in his hand was a small golden bloom of elanor, and a light was in his eyes. He was wrapped in some fair memory: and as Frodo looked at him he knew that he beheld things as they once had been in this same place. For the grim years were removed from the face of Aragorn, and he seemed clothed in white, a young lord tall and fair; and he spoke words in the Elvish tongue to one whom Frodo could not see. Arwen vanimelda, namarie! he said, and then he drew a breath, and returning out of his thought he looked at Frodo and smiled.
"Here is the heart of Elvendom on earth," he said, "and here my heart dwells ever, unless there be a light beyond the dark roads that we still must tread, you and I. Come with me!" And taking Frodo's hand in his, he left the hill of Cerin Amroth and came there never again as living man.
I remember the first time I read LOTR, that last phrase frightened me terribly, because I thought the Professor was indicating that Aragorn would be the next of the Fellowship to die! Needless to say, I was very relieved when this proved not to be the case. Still, it seems terribly sad to me that Aragorn never returned to Lothlorien in his lifetime, although I suppose this should not be so surprising, since after Galadriel leaves for the West, the remaining inhabitants of Lothlorien do not remain very long when the magic of Nenya begins to fade. Celeborn eventually relocates to Imladris to be with his grandsons. The others either depart for the West, or go to live with Legolas and his people in Ithilien.
The next time we hear of Cerin Amroth, it has become Arwen's "green grave" in the Tale of Aragorn and Arwen in the Appendices:
There at last when the mallorn-leaves were falling, but spring had not yet come, she laid herself to rest upon Cerin Amroth; and there is her green grave, until the world is changed, and all the days of her life are utterly forgotten by men that come after, and elanor and niphredil bloom no more east of the Sea.
How very sad! At least the Professor has seen to it that she will never be forgotten!