
Curaigh |

The wiki lists 'lost sky citadels' and the possible others. The Pathfinders worked on this question in the Glories of the Past trilogy (Halls of Dwarven Lore, Price of Friendship, and Secrets of Stones Keep). This revolves around the first lost citadel Koldukar and hinted to the second Jormurdun.
Spoiler:
Not really a spoiler if you read the description of each of those, but I try. :)

powerdemon |

Dosgamer wrote:
Here is a link to the wiki page that mentions lost and possible sky citadels. Good luck!
Link
Thank you. I was apparently looking at the wikia, not the wiki.

PFWiki Scribe |

powerdemon wrote:
Thank you. I was apparently looking at the wikia, not the wiki.
For those who don't know, we abandoned the wikia site long ago, and it is therefore much smaller than PathfinderWiki.com.