Via a link at Dark Roasted Blend, I came across an article called '10 Most Creative Chimneys on Earth'.
It's weirdly fascinating to see the pictures of these creations. Who'd have thought that the relatively mundane task of exhausting smoke would lead to such elaborate designs?
There are many more pictures at the link. Go read, and ponder whether your domestic fireplace might be improved by installing something similar . . . provided it doesn't bring the walls down!