Depending on the area where your school is located, why not do a
architecture scavenger hunt? Give each child a camera or a group of
students, and ask them to take pictures of interesting buildings. I
forgot to look at what grades you taught, but you could present the
history of architecture relevant to the area where you live. Students
then try to match examples presented in class. Is this making any sense?
If not mail me back, hopefully by then I will have gotten some real sleep.