Interestingly, before a London cabbie is licensed to drive a black cab, he (or very infrequently she) must pass a test known as The Knowledge. The test requires knowing almost 25,000 streets as well as the points of interest along these streets including squares, clubs, hospitals, hotels, theaters, embassies, government and public buildings, railway stations, police stations, courts, important places of worship, cemeteries, crematoria, parks and open spaces, sports and leisure centers, places of learning, restaurants and historic buildings. Average preparation for The Knowledge takes 34 months and passing the test itself usually requires upwards of 12 attempts. And London's taxi drivers have enlarged hippocampuses compared to the general population. The longer the cabbie's been driving, the bigger the hippocampus.
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