Denmark’s Ministry of the Environment have made a 1:1 map of the entire country in Minecraft. While not a first—the Ordinance Survey did a 50:1 mapping of the UK some time ago—it is probably the first full size rendering and it comes in at a whopping 1 TB of disk space. You can download it in 10240 m2 chunks, but since there are public servers available why would you bother?
There are three servers for different areas and three mirrors as well (it has been quite popular)—details here (original Danish page). There is also a real-time map to help get your bearings.
If you are downloading, the page scripts probably won’t work running through Google translator, so you’d need both the Danish download page and the translation open.