Kryptonopolis

Kryptonopolis was the largest city on Krypton after the capital, Kandor. After Kandor was stolen by the alien criminal Brainiac, Kryptonopolis became the new capital. The history of the city is tied to the history of the El family, the ancestors of Superman, as the original layout was designed by Superman's ancestor, Sul-EL.

Kryptonopolis is also the home of Jor-El and Lara, the parents of Kal-El. When Jor-El's researches discover that Krypton is fated to explode, Jor-El constructs an escape rocket for his young son. Jor-El launches Kal-El (the future Superman) into space shortly before the destruction of Krypton. Kryptonopolis is also destroyed in the explosion.

Superman movie (kryptonopolis)
In the 1978 film Superman: The Movie, the city of Kryptonopolis is shown in the first part of the film. While the name of the city is not mentioned in the film, it is named Kryptonopolis in the script. In this appearance, Kryptonopolis is portrayed as being constructed out of a white, crystalline material. As in the comic books, Kryptonopolis is destroyed when the planet Krypton explodes.