Spain is home to a network of pilgrimage "roads" guided by seashells, which collectively are known as what?

Known as "the Way of St. James" in English, the Camino de Santiago comprises several different pilgrimage routes, all leading to Galicia's cathedral of Santiago de Compostela. Staying in albergues (hostels) along the way, pilgrims are always greeted by passersby with a "buen camino!"

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