Ifca's Castle FOUND!
I've also been wondering about this song and I stumbled onto this old thread. Thanks to Joe Offer for the clue about the YWCA songbook. It turns out that Ifca is a Czech pronunciation of YWCA, so the answer has sort of been on this page for 13 years.
I've made a web page with my findings so far and I plan to add to it:
danaxtell.com/ifca
I plan to add a comments section, but you can email me in the meantime (see bottom of the linked page)
Enjoy.
-Dan