Mirror Metropolises of the Multiverse: Kandor-One and Metropolis-Two

When the Bottled City of Kandor was enlarged, it was decided that the planet where the sole surviving city of Krypton-One would reside on was the planet of Rokyn, However, Rokyn was a world on an interdimensional fault line, which shunted it into another dimension where the Kandorians, including  Supergirl's parents Zor-El and Alura, would live. This second Krypton would endure for over a thousand years, as its inhabitants would encounter the Legion of Super-Heroes.

Not to long after Raokyn's founding, during the Crisis in one timeline, Power Girl's adopted parents Kal-L and Lois Lane lived in a dimension accessed by Earth-Three's Alex Luthor, wherein Superman recreated the Metropolis of Earth-Two in perfect detail. While the actual city still endured on the Earth-Two that survived the Crisis event, this duplicate was in an adjacent dimension similar to Raokyn's, although without any additional residents of the actual Metropolis.

In place of actual survivors and descendants as those of Krypton-One that existed due to the survival of Kandor-One... a virtual Kandor-Two, wherein simulated copies of these long dead Kryptonians and their fabricated descendants lived, within the Symbioship. This ship was developed by scientist Zor-L and his wife Allura so that their daughter Kara Zor-L would be raised within her civilization prior to her arrival on Earth-Two wherein she became Power Girl.

Kara Zor-L would, like Kara Zor-El, return to her miniature Kandor later although it wasn't the home she now found on her new world... Earth.