The side door on the south side of the Russian chapel on the Mathildenhöhe in Darmstadt, Germany. The chapel now looks magnificent after the recent renovation work has been completed. For some reason, this image reminded me of the name of the last studio album by Led Zeppelin. Further details about this magnificent building: de.wikipedia.org/wiki/Russische_Kapelle_(Darmstadt) (German only, but you'll get the idea) Please view in full size for the best effect.
