I created this a few years ago and it now adorns our maths corridor. It started by having a Pi number line. There are lots readily available to download. We used one containing the first 1000 digits, I think our corridor was long enough to fit the first 600-700 or so. The idea being that the number of digits discovered relates to a point in history.
I never quite got round to finishing this. If anyone fancies doing some of their own research on the history of pi, and filling in the blanks, then please do so by editing this document. Otherwise, just use what is there – it’s still an interesting story!