https://www.newscientist.com/article/mg12617212-800-science-the-day-the-sweet-track-was-built/ "The oldest known man-made footpath in Europe the 1800 metre-long Sweet Track across the Somerset Levels in southwest England – was built from oak and other timber felled in the winter of 3807/3806" ... "British archaeologists now have a continuous tree ring chronology for the period 4989 to 381 BC. This can be used to date timber at prehistoric sites throughout England." The fact that we can pin the year that a track was constructed nearly SIX THOUSAND years ago is just incredible!