Click to see 600 px versions.
This is my entry: I turned the Chocomel factory into a brewery - there was no Chocomel (chocolate flavored milk) in the Middle Ages. I had to change a few more things along the way:
I have two extra minifigs. I had to, because there was no electricity, so more manpower is needed. Instead of the streetlight, a boy has to hold up a torch. And somebody needs to manually pull those chains.
There is a quite a lot more vegetation in my version - obvious, there weren't so well groomed streets and sidewalks back then. There are some rocks, too.
The traffic sign is a replaced by a sign that explains that there's a brewery here - in a language that even analphabetics (95% of the population, at least) can read.
The flower stall has become a fruit stall - now who would buy flowers in the Middle Ages? But farmers did come to the city to sell their produce of course.
And the gentleman with the suit and the letter has become a knight with a shield and a sword, obviously. And he walks on the road instead of crossing it.
Two more views from different angles, click to enlarge:
my main image is larger, but the 600 px version that the main image here links to is of course my official entry.