I thought it would be best to answer this publicly, and in Shireroth. Plus, I wanted a legitimate excuse to come back and haunt the halls for a time!
The capital of Halluci was Hallucidagrad, which was located on the Southern Isles in what is now known as Lesser Attera. The exact location is, I'm afraid, lost to time. Castle von Scot, the Castle of the first Baron Austi Scot is located within the capital. The Boomist temple with the Boomist stone given to Hypatia is also lost, it seems. However, perhaps Hypatia might know where it is or where it was (if she is even still around?).
There a number of wikipedia articles regarding Hallucination, and despite at least one of them saying 'from Oz' I neither remember creating them, nor remember having the ability to code in Wiki so flawlessly. Regardless, here are the endings to a few pages I've found browsing.
/Duchy_of_Kildare
/Written_Halluci
/Halluci
/Hallucidagrad
/Castle_Von_Scot
/Austi_Von_Scot
/Boomist_Stone
/Temple_of_Ryvenna
/Ozarka_Monto
Also, as a last note, the only city I can see on the map that I founded that still exists is Port Halluci, on the lake in northern Old Hallucination. If you need anything else, I'll be around for a few days here at least, and am always contactable in Alexandria.