In Iceland, a hand-drawn map can get your mail delivered to the right address. Tourists who had visited a farm and mini zoo wanted to send a thank you postcard but forgot the address, so they drew a map of the area instead. It not only worked, but is not an uncommon occurrence in place where only 300,000 people live in an area the size of Ohio. Source

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Someone in Russia also tried the map-drawing idea. It worked, too!