Update: See more of the mosaics in this post from February of 2021.
The Mary Chapel at the Shrine of Our Lady of the Snows is easily one of the most unique interiors I have entered. It really is the back stage of the exterior facing shrine, and the architect made use with what he was given.
Strange, curving walls with the Aurora Borealis shining, with a shiny column in aquamarine that is the exterior of the alcove where the statue of the Madonna and Christ stand, dominate the space.
The space is very difficult to photograph because there is not really any central space; the room is crescent in shape.
At first glance, it looks as if the Aurora Borealis is backlit, but in reality I believe it is silver with light reflecting in through the windows.
What appears to be dark stone on the exterior, as I suspected, is actually broken up pieces of stained glass; it creates a truly beautiful mosaic of light. See the Christ the King Chapel down below here.