Researching the famous walk in Spain, I started (as usual) with Wikipedia:
The Way of St. James or St. James’ Way, often known by its Spanish name, el Camino de Santiago, is the pilgrimage to the Cathedral of Santiago de Compostela in Galicia in northwestern Spain, where the remains of the apostle, Saint James the Great, are said to be buried.
Way of St. James – Wikipedia
The standard route — the Camino Francés (French Way) — is 800km route from Roncesvalles in the Pyrenees. But there are many variations starting as far away as France, Germany, and further afield.

(larger version – Regenisis.org.au)
I got interested in this walk, more religious pilgrimage than “best hike”, after reading an excerpt from a new book by Ward called All the Good Pilgrims : Tales of the Camino de Santiago.
Robert Ward has always enjoyed travelling, especially on foot. When he discovered the ancient pilgrimage route to Santiago in Spain, he felt compelled to walk and experience this historic road. From his first journey along the Camino de Santiago, Ward fell in love with the pace, landscape, history, art, and romance of this old pilgrimage path.
Above all, however, Ward fell in love with the people of the Camino—both the welcoming Spaniards and the pilgrims who come from all over the world to find out what it means to travel five hundred miles, one step at a time.
In All the Good Pilgrims, Ward returns to Spain to walk the Camino for the fifth time. He thinks he knows what he’s getting into but, as his many Camino journeys have taught him, the Camino never runs out of surprises. Each day brings new lessons, friendships, questions, memories, gifts and challenges, reminding Ward that it isn’t the pilgrim who walks the Camino—it’s the Camino that walks the pilgrim.
An engaging travel narrative, All the Good Pilgrims is a personal and insightful tour of the Camino de Santiago, as Ward takes readers on a secular pilgrimage in which he reflects on his past journeys and contemplates the mysterious and enduring allure of this ancient and historic road.

Amazon.ca