Pilgrimage appears in traditions that share no history with one another, and the routes resemble each other more than the beliefs surrounding them do. The similarities point to how the practice works.
The journey is the practice, not the transport
Almost every tradition places requirements on how the destination is reached, whether on foot, by a specific route, or with particular restrictions during the journey.
If arrival were the point, those requirements would be arbitrary obstacles, and modern transport would have rendered pilgrimage obsolete.
Instead, walking routes have grown in use even as travel has become easier, which indicates that the effort is the substance rather than the cost.
Separation from ordinary life is structural
A pilgrim leaves home, roles, work and usual company for a defined period, and that removal is what allows the journey to function differently from a holiday.
Anthropologists describe such periods as liminal: the person is temporarily outside their ordinary social position, and the usual rules are partly suspended.
The relationships formed between pilgrims in that state are noticeably different from ordinary social ties, being intense, temporary and largely stripped of status.
Sustained physical effort changes the mental state
Walking for many hours daily over weeks produces fatigue, simplification of concerns and a narrowing of attention to immediate physical matters.
That narrowing is reported consistently, and it accounts for much of what participants describe as clarity, since most ordinary preoccupations cannot be sustained in that state.
Discomfort is part of the mechanism rather than an unfortunate side effect, which is why traditions frequently specify conditions that make the journey harder than it needs to be.
The destination provides the frame
A defined endpoint gives the journey a shape, with a beginning, a measurable progression and a completion that can be recognised by others.
Without that frame the same walking would be exercise, and the difference in how participants describe it is substantial.
The endpoint also connects the individual journey to everyone who has completed the same route, which supplies continuity that a private undertaking would lack.
Secular routes reproduce the same features
Long-distance walking routes with no religious content have grown considerably, and walkers report experiences closely resembling those described by pilgrims.
They share the essential elements: extended duration, physical effort, separation from ordinary roles, a fixed destination and a community of others doing the same thing.
The overlap suggests those features, rather than the doctrinal content of any particular tradition, are doing most of the work.