While I was in Glasgow I noticed these metal plates on the wall of the "City Chambers" at the east end of George Square. Today, there are insanely complex ways of determining the exact length of a meter and such like. While these metal measures are not really some form of international standard, I do like the way they point back to a simpler age. Unfortunately, the measures of the longer distances are either no longer there, or they were hidden.
You can find more close-ups of our world at Macro-Monday2.