Maps played a key role in ending the famous in just a matter of days.
Given the sophisticated technology at our fingertips - it's quite a surprise to learn that had if it happened today, experts say couldn't have done what he did.
I went to Broadwick Street in London's Soho area with Secretary of the John Snow Society, Dr Rosalind Stanwell-Smith, to find out why.
Jump to more content from this blog
±«Óãtv © 2014 The ±«Óãtv is not responsible for the content of external sites. Read more.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.
Email us
Listen to iPM