Ley lines are alleged alignments of a number of places of geographical interest, such as ancient monuments and megaliths, natural ridge-tops and water-fords. Their existence was suggested in 1921 by the amateur archaeologist Alfred Watkins, in his books Early British Trackways and The Old Straight Track. Watkins theorized that these alignments were created for ease of overland trekking by line of sight navigation during neolithic times and had persisted in the landscape over millennia. Where Ley Lines meet, Reese can see Muna, and once some Adults in The City Library.