The Camino Aragonés is one of the ancient pilgrimage routes which together form the Camino de Santiago (the Way of St. James). The Camino Aragonés officially starts at the Somport Pass 1500 m. up in the Pyrenees. But it is best to start it from a lower level, at Oloron St. Marie or at Pau, since this side of the Pyrenees has some terrific scenery.
The Camino is well marked both in France and Spain, and there are plenty of albergues and refugions where you can stay cheaply in the company of other pilgrims on the route.
The main highlights of the route are the river Aspe which
keeps you company up to the Somport Pass, the now-abandoned
International Station at Canfranc, the Rio Aragon which accompanies
you most of the way in Spain, the ancient city of Jaca, the
monastery of San Juan de la Pena (slightly off the route)
which is carved into the solid rock, the little villages such
as Artieda and Arres (with whole streets of deserted houses),
the churches and mansions of Sanguesa, and the magically beautiful
octagonal church of Eunate just before this Camino joins the
Camino Francés at Puente la Reina. There is then (only!) another
683 km. to reach Santiago de Compostela.