Yeah, this just came to me and I was wondering if you would like to design your own fortress.
Not actually draw it but just describe it. You would get to control the landscape around it, the walls, the turrets, how the forces will be assembled, etc.
Of course, I'm thinking like the Middle Ages too. I thought that this might be fun to do.
What would be the point if you can't draw it?
* Turrets
* Towers
* Battlements
* Cannon holes
* Thin windows for archers
* Moat
* Thick walls (Moats are much more effective so both is even better)
* Built on a big cliff so that an attack is virtually impossible
* One big tower to spot enemies from afar
* Ridges on the pathways to assist in rolling up cannonballs
* Drawbridge
* Chapel at the top, why not? Most castles/forts did.
* Pots and pans holes for dumping objects and boiling water.
* Spires
Pretty much the usual stuff.
http://rjanes.co.uk