Griff, I can't recall how old your youngest is, but here's the
link to the Coursera class I'm taking, "Archaeology's Dirty Little Secrets" by Sue Alcock of Brown University.
It's free, there's no requirement to actually complete any of the assignments or quizzes, and one can spend as much or as little time with it as one likes. It's certainly academic in nature, but so far it's been really interesting. There are videos to watch and recommended readings, all online and again, for free.