I live less than 2 miles from Transfiguration and pass immediately by it two or three times a week, but must confess that I haven't been inside in probably 2 deacades - clearly the time has come for a return visit. It has always been a very beautiful temple but that beauty has clearly now risen to a new level - one of Wow and double Wow, as David and Kolya have said.
Mosaic iconography is indeed magnificent and, as Nataly, notes expensive - which is why one usually only sees it on a small level. This is extraordinary!
Thank you, Rose, for finding this.