Over 20 people have made creations as small as hidy-holes on their way in a 50,000 block journey, to massive builds that may include some neat redstone. This world was started as soon as 1.7 came out and the world rendering changed. This world still runs today, and will forever...unless they change the world rendering again. We have found 1.10 and 1.11 chunks, so don't worry, there's a lot still to be discovered.