St Stephen's Cathedral in Vienna has the best roof. It has these fabulous coloured wooden tiles arranged in this brilliant chevron pattern. Looks great from the ground but I highly reccommend climbing to the roof of the unfinished tower to view it up close. Although do not, I repeat, do not do this if you are afraid of heights! Once you get out of the lift you climb a few steps made of the kind ironwork you can see through and which are attached to the outside wall of the tow