Gondolin, also known as the Hidden City or the White City, was a legendary Elvish city that is almost too beautiful and magical to be believed. It was built in secret by Turgon, one of the High Kings of the Noldor elves, after he had a vision from Ulmo, the Lord of Waters. Ulmo instructed Turgon to build a hidden city, where the elves could be safe from the threats of Morgoth, the Dark Lord. Thus, Gondolin was constructed in a hidden valley surrounded by the Encircling Mountains, with only one narrow pass as an entrance. The city itself was a marvel to behold, with its white walls and domed roofs, adorned with elves' finest craftsmanship and magical gems. The city was also said to have fountains, gardens, and minarets, all adding to its enchanting beauty.

Gondolin was not only a city of beauty but also of great strength. Its defenses were strong and impenetrable, protected by mighty walls, towers, and gates that were guarded by the skilled elven warriors. The city was also blessed by powerful protective spells, making it nearly impossible for any enemy to find or enter. This, coupled with the fact that the city was built in a hidden valley, made Gondolin a safe haven for the elves, allowing them to live in peace and harmony.

The citizens of Gondolin were no ordinary elves. They were the most skilled and talented among the Noldor, with exceptional craftsmanship and great knowledge of magic. They were also known for their love of song and poetry, and their halls were filled with melodic tunes and the sound of harps. The city was ruled by Turgon, who was loved and respected by his people for his wisdom and fair rule. Under his leadership, Gondolin flourished, and its fame spread throughout Middle-earth.

But despite its wondrous beauty and seemingly impenetrable defenses, Gondolin's fate was doomed. A traitor, Maeglin, revealed its location to Morgoth, who sent his army of orcs and dragons to attack the hidden city. The elves fought bravely, but they were greatly outnumbered and overpowered. In the end, Gondolin fell, and only a few of its citizens, including Turgon's daughter, Idril, and her husband, Tuor, managed to escape.

Gondolin's fall was a tragic event that brought great sorrow to all elves, as it represented the loss of their once-great and protected city. The memory of Gondolin lived on, though, as its glory was immortalized in song and tale, and its destruction served as a reminder of the dangers of treachery and the constant threat of evil in the world. Gondolin may have fallen, but its legacy would live on forever in the hearts and minds of those who knew of its existence.