There should be an Augmented Reality app for London that shows you how it was around 1,800 years ago, whereever you are standing, mobile phone in hand. On the

There should be an Augmented Reality app for London that shows you how it was around 1,800 years ago, whereever you are standing, mobile phone in hand. On the top of the Shard, there is an AR telescope that shows you what is in some of the buildings of the cityscape, which is already very useful. Imagine something similar, but pointing to Roman times in "Londinum".