How the heck...

[G-Max]

Okay, so I was playing Earth1000AD with the Gods of Old mod and Permanent War or Peace turned on... y'know, like all the cool kids do... and eventually I noticed this:

Spoiler :

Somehow, when the Great Wall got built, EVERYBODY got their own wall. What causes this to happen?

 

[strijder20]

Zomg that looks EPIC.

 

[Hescumet]

Screenshot is from Sid Meier's Railroads! Deluxe