Tirion upon Tuna is the fictional metropolis which appears in J.R.R. Tolkien's fantasy novel "The Silmarillion"
Located between the dark shadowy waters of the great ocean and the bright lands of the blessed realm of Aman, where the Powers dwell.
Tirion was built by the Vanyar elves in the Calacirya, a valley which connects the two realms, the only place in Aman where light filters through the margin of the encirceling mountains,, The Pelori, and illuminates the other side.
On a hill named Tuna, lies the shadowy city of Tirion.
But Meneldur forbade the Queen and the sisters of Aldarion to bear the bough of oiolaire to Rŏmenna where lay the Palarran, saying that he refused his blessing to his son, who was venturing forth against his will; and Aldarion hearing this said: ‘If I must go without blessing or bough, then so I will go.’
Then the Queen was grieved; but Erendis said to her: ’ Tarinya, if you will cut the bough from the Elven-tree, I will bear it to the haven, by your leave; for the King has not forbidden it to me.’
The mariners thought it an ill thing that the Captain should depart thus; but when all was made ready and men prepared to weigh anchor Erendis came there, little though she loved the noise and bustle of the great harbour and the crying of the gulls. Aldarion greeted her with amazement and joy; and she said: ‘I have brought you the Bough of Return, lord: from the Queen.’ ‘From the Queen?’ said Aldarion, in a changed manner. ‘Yes, lord,’ said she; ‘but I asked for her leave to do so. Others beside your own kin will rejoice at your return, as soon as may be.’
At that time Aldarion first looked on Erendis with love; and he stood long in the stern looking back as the Palarran passed out to sea.
"In that hour Lúthien came, and standing upon the bridge that led to Sauron's isle she sang a song that no walls of stone could hinder. " It's something like a dream or allegory. A girl and a big white dog are standing in front of a dark castle - Luthien is sending a challenge to Sauron, and he'll come.
"She spoke no word; but being filled with love Elwë came to her and took her hand, and straightway a spell was laid on him, so that they stood thus while long years were measured by the wheeling stars above them; and the trees of Nan Elmoth grew tall and dark before they spoke any word."