Here's a few pictures of some timeline items.
Ha, ha! The fall of Rome (by Abby)
Mouse Guard! (by Faith)
This one is a personal favorite (by Faith)
It's a long strip of masking tape, marked every five inches, from 4000 BC to AD 2100. The BC dates are by millennium and the AD dates are by century. When we get back around to the Ancients we'll need to alter the BC scale, but that shouldn't be a problem - there's more wall left.