"Now the streets of Gondolin were paved with stone and wide, kerbed with marble, and fair houses and courts amid gardens of bright flowers were set about the ways, and many towers of great slenderness and beauty builded of white marble and carved most marvelously rose to the heaven. Squares there were lit with fountains and the home of birds that sang amid the branches of their aged trees, but of all these the greatest was that place where stood the King's palace, and the tower thereof was the loftiest in the city, and the fountains that played before the doors shot twenty fathoms and seven in the air and fell in a singing rain of crystal; therein did the sun glitter splendidly by day, and the moon most magically shimmered by night. The birds that dwelt there were of the whiteness of snow and their voices sweeter than a lullaby of music.
the Vala Ulmo, the Lord of Waters, revealed the location of the Vale of Tumladen to the Noldorin Lord Turgon in a dream around the year FA 50. Under this divine guidance, Turgon travelled from his kingdom in Nevrast and found the vale in FA 53. Within the Echoriath just west of Dorthonion and east of the River Sirion, lay a round level plain with sheer walls on all sides and a ravine and tunnel leading out to the southwest known as the Hidden Way. In the middle of the vale there was a steep hill which was calledAmon Gwareth. There Turgon decided to found a great city that would be protected by the mountains and hidden from the Dark Lord Morgoth.
For nearly seventy-five years, Turgon and his people built Gondolin in secret. After it was completed in FA 116, he took with him to dwell in the hidden city his entire people in Nevrast — almost a third of the Ñoldor — as well as nearly three quarters of the northern Sindar. The city stood for nearly 400 years until it was betrayed to Morgoth by Maeglin, Turgon's nephew, and sacked by the army of Morgoth the Dark Lord.