Crystal City

The Crystal City is a location from the Generation 1 continuity family.

Shiny.

The Crystal City was famous for its elegance in construction, and the scientific minds that hail from it. It also has a habit of getting slagged by those who fail to recruit certain inhabitants.

I remember it. The most spectacular city on Cybertron.Optimus Prime, "The Secret of Omega Supreme"

Fiction

The Transformers cartoon

Dammit Bonecrusher! You left the oven on!

Millions of years ago, the Crystal City was one of the most beautiful structures on all of Cybertron. It was built by the Constructicons and their then-teammate Hauler RoadHauler's toy bio and protected by a Guardian robot named Omega Supreme. Omega and the Constructicons were dear friends, although they didn't get to visit him and the city very often.

Tragically, the very Constructicons who created this masterpiece were responsible for its destruction. They were ambushed by Megatron and his Robo-Smasher, which turned them evil. Under his orders, they lured Omega Supreme away from the Crystal City with a false story of a nearby Decepticon attack. He was reluctant to leave his post, but took the Constructicons at their word when they promised to protect the city in his absence. Once he was gone, they razed the structure to the ground. The Secret of Omega Supreme

IDW Generation 1 comics

Early in the Great War, a group of Cybertronians called The Circle Of Light decided Cybertron's fate was sealed so they left the planet with a group of scientists, scholars and general pacifists. They settled on an unnamed planet and to hide their existence from the expanding war, built the new Crystal City underground. The Transformers: Drift

Cybertron

Downshift and his lifebond partner had planned to spend some time at the Crystal Cities for their honeymoon, but then Cybertron was evacuated. Downshift's Cyber Key Code text

Shattered Glass

Starscream was once one of the most brilliant scientific minds to hail from Crystal City, until Optimus Prime tried to recruit him into his evil Autobots. Starscream refused, and Prime had Crystal City destroyed while Starscream watched in horror. Starscream's toy bio

Animated

Ratchet once courted a girl from Crystal City who reminded him of Arcee. The AllSpark Almanac

Exodus: The Official History of the War for Cybertron

Crystal City was the home of Cybertron's scientific elite. Shockwave worked there, as his innovations in stressed-crystal material allowed the large-scale usage of it in the city's construction. He was made to leave when his combination experiment, Bruticus Maximus, failed. Before the war, Soundwave sent Frenzy and Rumble to look for the Matrix of Leadership within the city. They overheard plans to reactivate Omega Supreme, Guardian of Cybertron's artifacts, as well as information on the Code Keys and the Plasma energy Chamber that became useful during the final days of the war.

It was destroyed in the fourth offensive of the war, as Shockwave returned with a vengeance by unleashing his perfected combiner, Devastator. Devastator loomed over the Refracting Gardens and smashed open the wall, allowing the Decepticons to flood in. They took their time, smashing each and every object and piece of architecture. Watching on the Communication Grid, Alpha Trion remarked the dazzling display of light and colour as Crystal City collapsed was the most beautiful thing he had ever seen. Some scientists managed to get out of the underground laboratories, taking some of their research.

In the aftermath of the battle, Shockwave set up camp at Crystal City and reactivated Bruticus. The Geosynchronous Energon Bridge below the ruins also became of strategic importance in the war's final days. Exodus: The Official History of the War for Cybertron