John Man’s work did not disappoint (excluding the humorous typo of “a a” when only the single article use was intended).
Starting with the Americas, then working Eastward to Europe, the Islamic region, and Asia before moving back west but south to Africa and then finally to Oceania, Atlas of the Year 1000 provides a fantastic glimpse of the state of the world a millennium ago ± 50 years.
From the Introduction on the significance of the year 1000:
[B]y pure coincidence, the year 1000, or thereabouts, marked the first time in human history that it was possible to pass an object, or a message, right around the world. This had, of course, been almost possible for a long time. Although no culture knew what the world looked like, and few had any idea of its size, almost every habitable region had been peopled for thousands of years, and almost every culture had a neighbour or two. Messages and artefacts had been passed between neighbours, across continents and between continents. Such messages – pottery styles, agricultural techniques, new technologies, religions – are the stuff of cultural diffusion.
I highly recommend the book to anyone who is looking for what avenue of historical inquiry they wish to follow next, or to be reminded that nothing happens in isolation – as isolated as some of these cultures were from each other, there were myriad other cultures operating at the same time around the world.