Must see in "Large"!
This is San Marco church at Piazza San Marco in Venice.
The inside is completely clad with gold. It's really an incredible sight. This was taken from the upstairs balcony with a fisheye lens. The warm light came from the big stain-glass window behind me which lit up the room and especially the golden wall in all kinds of colours.
You can even see how the shadows got filled in by the reflection of the gold.
HDR from 3 images.