Walled defended obstacle
I really like this walled enclosure which could act as a good defended obstacle which can be filled with your favourite fantasy buildings. Good against Bretonnians and all other cavalry who will lose their charge bonus, your opponent might not like it though :)
If you're interested it's supplied by Cresent Root Studio:-
crescent-root.com/product/15mm/15tb/15tb3.htm
Image used without permission.