Here's my annual April 1st map. I got the idea to make a map of the world a long time ago, but never got very far because making the continents recognizable is tough. A few years ago I tried making them out of boxes, but it looked horrendous and the frame rate was just as bad. So, I put this map idea on my list and forgot about it until I'd figured out Wings3d a bit better.
Once I began building it in Wings3d, I realized tanks wouldn't be able to move to other continents very well due to the distance. I thought about teleporters or jump pads, but those can be finicky in the heat of battle. So I then I based the map off the game Risk and pushed the continents closer together. I thought about adding a stack of cards and dice for cover, but decided to go with a more realistic look.
Tanks can easily jump from South America to Africa, and they comfortably fit on Corsica. There's a bit of a bottleneck on Iceland though, but it's consistent with Risk. There's also a teleporter from Alaska to the Kamchatka peninsula. My Risk board didn't have New Zealand, so I didn't add it either. I was almost certain I'd hear about it, and 45 minutes after hosting it I got this report: "missing New Zealand! :(" :P

Basically I started with a 20x20 grid in Wings3d. Then I used the snap image feature to put a texture of a map onto the top of the grid. Then I simply built up the coast line by cutting and connecting lines. It's incredibly tedious, and I probably spent a week and a half just making the coastline. It would have been a lot easier if I could have just moved existing points, but then the texture would stretch. So yea, I can see why this idea hasn't been done before.

To add a bit of cover, I tried to add a landmark or two for each continent. I tried to make these models stylized representations with a low face count. Below are pictures:

Great Pyramids, Egypt

Great Wall of China

Stepped Pyramid, South America

Ayers Rock, Australia

Straw Huts, Africa
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St. Basil's Cathedral, Russia | The Taj Mahal, India |

A Pagoda, China

Colonial Williamsburg Capital, United States