Well you should check out Brussels as it's not far fram Aalst, and the war museum is indeed quite something. Than some other classics are Brugges (medievalstyle town), Antwerps is also quite nice, Ghent, and you can always drop by in Leuven of course. Now if it's WWI you want to see you've got to go to Ieper and surroundings. For WWII it's the Ardennes, but that's quite far from Aalst. (wel not that anything is ever really far away in Belgium).
And if you have questions about belgium, you can always ask me. (Being Belgium I think I should be able to help. :))
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