Terence McKenna claimed both psychedelics and travels to be very affective and similiar tools that help expand the mind. Connecting these claims with the observations of Aldous Huxley, who proposed the mind and the physical Earth(terrains, continents, landscapes) to be conjoined with a shockingly strong bond We can see Terence's idea making Huxley's words fuller, more clear, and more credible.
You can see, one's mind is in a great part shaped by his everyday environment & actions. Repetitions lead to the creation of bonds. Revisiting these paths without a doubt creates a map of some kind.