The Old Straight Track: Its Mounds, Beacons, Moats, Sites and Mark Stones is a book by Alfred Watkins, first published in 1925, describing the existence of alleged ley lines in Great Britain.
[1] Watkins presents a methodical and thorough exposition of his theories of ley lines, following an earlier much shorter publication, "Early British Trackways" (1922).
According to a review in The Geographical Journal of the Royal Geographical Society, Watkins sought to prove that "mounds, moats, beacons and markstones fall into strait tracks, i.e. sighted lines, throughout Britain, with fragmentary evidence of trackways on the alignments.
[4] Watkins' work met with early scepticism from archaeologists, one of whom, O. G. S. Crawford, refused to accept advertisements for The Old Straight Track in the journal Antiquity.
[5] One criticism of Watkins' ley line theory states that given the high density of historic and prehistoric sites in Britain and other parts of Europe, finding straight lines that "connect" sites is trivial and ascribable to coincidence.