Today's collaboration with Cellar Image of the Day brings us photos of the Stockholm metro stations, which have bedrock exposed, either untouched or painted, as part of the decorations!
Original Link at Archibase - via digg | Mirror at Cellar Image of the Day.
Be sure to check out Cellar IotD for more amazing photos (don't miss the 6 years' worth of archives!)
Too bad it's in Stockholm.