Medieval Bridges David Harrison considers one of the greatest but most underrated achievements of the medieval world: the hundreds of bridges that defined the British communication system up to the 19th century. David Harrison | Published in History Today Volume 54 Issue 11 November 2004 To continue reading this article you will need to purchase access to the online archive. Buy Online Access Buy Print & Archive Subscription If you have already purchased access, or are a print & archive subscriber, please ensure you are logged in. Please email digital@historytoday.com if you have any problems.