I love Chester — it's a walled Roman fort town in the North West of England, with heaps of history. On a walk through the Roman Gardens, we came across a real-world Augmented Reality experience that described the breach of the walls in the time of the English Civil War.
I thought it was rather neat: With the associated information on the board, it gave me a sense of what was happening in that period. The experience got me thinking about Augmented Reality on modern smartphones and headsets (I've been lucky enough to play with a Magic Leap) — the use cases we will demo with these devices are just not worth the cost of development right now.