The worst place in the world to play frisbee

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One of two overflows on the dam of the Ladybower reservoir, Derbyshire. The sizes of the steps are distributed hyperbolically meaning that it is impossible to lean over to see the bottom no matter how far down the hole you go, supposing you were mad enough to try. In this regard it resembles the Devil’s Staircase, (see Fractal Geometry of Nature, B. B. Mandelbrot 1983, p. 83). During the war the reservoir was used by 617 Squadron to practice with the Barnes Wallis bouncing bomb.