London Taxicab drivers who passed The Knowledge were forced to develop very detailed mental maps of London. According to wikipedia, it is the world's most deman

London Taxicab drivers who passed The Knowledge were forced to develop very detailed mental maps of London. According to wikipedia, it is the world's most demanding training course for taxicab drivers. https://en.wikipedia.org/wiki/Taxicabs_of_the_United_Kingdom#The_Knowledge https://en.wikipedia.org/wiki/Taxicabs_of_the_United_Kingdom... http://www.nytimes.com/2014/11/10/t-magazine/london-taxi-test-knowledge.html?_r=0 http://www.nytimes.com/2014/11/10/t-magazine/london-taxi-tes...