I don't know how accurate this is, as I haven't read the book, but I found an online map which seems to map the exact paths he took, so it seems that you can take the same journey as him.
The website is called LITMAP (Literature Maps) which appear to have used google maps to trace the paths. It can be found here.
I'll add a couple of screenshots below:
It starts off and has the majority of sites around the east of England:
But zooming out reveals it is across the world:
It also very helpfully has text down the side for each location with the relevant quote from the book. It also has page numbers. It starts at the Norfolk and Norwich Hospital University and ends at Coburg, which reading the summary of the book suggests this map is accurate.
Also note that by clicking on a section of text in the right hand column, it highlights that particular place in the map.