This page is under constant revision. There are many wonderful links to pictures of art from each period, as well as resources for further study.
All ages can benefit.
But they are a blast. They give the child a complete project kit which includes everything they need for materials to build something. They have work tables set up with hammers, wood glue, screw drivers and anything else needed. Looks like an interesting site. Direct link to a Byzantine illumination of Jesus' prayer in Gethsemane, for Upper Grammar students wishing to make a copy.