Ordinarily, I don't like icon museums: they should be in Church. There are exceptions. This is one (another was the exibit that the Art Institute put on a decade ago. They had bishop icongraphers come in to speak and have workshops). But I like the first hall, with the reproduction on the walls of the icons in the catocombs (so much for the "blank walls" Protestants claim for the Early Church), giving a sense of the roots of iconography. The other room, with the pictures of people at worship etc. is very effective at conveying what the icons are for. So too the icon corner one.