puzzle

Please propose the photo for The Most Difficult Puzzle. 'The most difficult' is crucial but remember that the photo must be interesting as well (i.e. puzzle with a single tiled roof would be hard to put together but extremally boring so I would prefere an aerial view of whole town/city with hundred tiled roofs). Please do not submit photos for regular puzzle (sunset, sunrise, horse, dog, cat, flower, castle, girl, dolphin, car or any other corny or fabulous stuff). Do not submit photos with plain surfaces (i.e. blue sky or just single color) or grainy patterns (i.e. sand or starry sky). Be reasonable and keep the balance between 'hard' and 'entertaining'. Please read ALL additional and post-processing rules.