There is also The Ring in the Xeelee universe - which is millions of lightyears across: https://xeelee.fandom.com/wiki/The_Ring https://xeelee.fandom.com/wiki/

There is also The Ring in the Xeelee universe - which is millions of lightyears across: https://xeelee.fandom.com/wiki/The_Ring https://xeelee.fandom.com/wiki/The_Ring Mind you it might not count as it's a means of escape, not a place to live.