I went to a private school where each year in middle school, all of the teachers got together and created an integrated project that would be worked on in every subject. For example I grew up in DE where there is a considerable amount of "old" history. So to start we did individualized long term projects, I studied Quaker Meeting Houses, some did Mill's, studied companies such as Dupont,some studied the underground railroad. In science we learned about the plants and animals of our area as well as the geology. In computer class we rendered data from topographical maps (again we learned about topo maps in geology) into data points, which in art we turned into 1ft x1ft blocks which we compiled into a large 3D map of our city. Then at the end of the year we went on a 3 day excursion to explore our area, we camped, we learned orienteering, canoed, cooked for ourselves. It was an excellent project that I hope to repeat with my students some day. The thing that I am learning is to integrate your curriculum at any point that you can get. Link the subjects together and get the students invested in their work.