Definitely, one of the most important things was the building of castles.
Read about Norman castles: http://www.primaryhomeworkhelp.co.uk/castles/normancastles.htm
Watch the following video
What are the characteristics of a Norman castle? Make a list.
Find a picture of a Norman Castle in Britain
Draw one castle and describe it. Point out all the important parts castles used to have.
Why were castles important?
EXTRA: if you like minecraft….design a castle and share the picture