A photograph of Reschensee, an artificial lake with a 14th century church mostly submerged within it.
I don’t know if I’ve ever seen anything in real life which was a better hook for an adventure than this.
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I would hazard a guess its the creative inspiration for parts of http://en.wikipedia.org/wiki/Tintin_and_the_Lake_of_Sharks and http://en.wikipedia.org/wiki/Castle_of_Cagliostro