The theme of this year's Historicon was "Brother against Brother," so the American Civil War was well-represented.
Downtown Mogadishu, for a "Black Hawk Down" scenario.
WWII in the desert. From the look of it, Flames of War is huge, but competing rulesets do not appear to be going anywhere.
I thought this Egyptian tomb was gorgeous, and the award in the upper right hand corner suggest that the judges thought so, too.
This setup for the battle of Chattanooga (in 10mm, my favorite scale) was huge, covering at least 30 feet end to end. That's Lookout Mountain in the distance.