The Peace Cathedral in Tbilisi has a working church, mosque and synagogue all in one building. Unbelievable, right?
Anyway, great place, and the harmonium is a fantastic instrument with a really soft attack (ADSR). You have to pedal with your feet and there are reeds like on an accordion inside. It's really rare to find a harmonium in working condition these days and even rarer to kind someone that can actually repair it, let alone understand the workings of this beautiful instrument.
Evangelical-Baptist Church of Georgia., 6 სპირიდონ კედიას ქუჩა, Tbilisi