For over 25 years Hans Jilesen has been searching for and researching ley lines and prehistoric paths, making him one of the foremost experts in this field. He developed his own method for finding these alignments with the help of the thesis of the Austrian professor of architecture, Dr. J. Purner, the coordinate calculation program developed by the Cambridge archaeologist J. Watson, and the distinction between man-made and natural lines formulated by the Dutch geographer Dr. M. Kooistra.