Maps produced by the Swiss Federal Office of Topography (Swisstopo) undergo a rigorous proofreading process to ensure accuracy. For decades cartographers at that office have attempted to outsmart that process by inserting barely visible illicit drawings onto official maps.
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| A marmot is hidden on this map of of the Swiss Alps |
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| A fish in a French nature preserve |
Some of the rogue mapmakers inserted their drawings just before their retirement to avoid being fired from the agency. A spider, a man’s face, a naked woman, a hiker, a fish, and a marmot are some of the images that have been inserted over the years.
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