The cutaway map above shows part of the underground city of Derinkuyu as it would have appeared at its peak during the Byzantine era.
The city is the largest of of over 200 underground cities discovered so far in Cappadocia, Turkey.
The map above shows just how many people live in London. The blue area above has the same population as Scotland, 5.3 million people.
And the pink area contains the same population as Scotland, Wales and Northern Ireland combined, a little over 10 million people.
Risk is without a doubt the best known and loved, map based board game, of all time. And, while it may not be the highest rated strategy board game, it remains a must-own classic.
However, there’s no reason to limit yourself to the standard board!
Below we look at the 27 best Risk board game versions ranked from best to worst based on real player reviews from Boardgamegeek.com.