This outermost barrio of Santiago was once the closest point that pilgrims affected with leprosy were permitted to go.
The walk into Santiago is through the urbanized zone that has grown up around the old town. After passing over the highway bridge the first part of Santiago you walk through is the Barrio San Lazaro; the church here is said to be the limit for pilgrims with leprosy. There is a fairly large intersection to cross where the arrows disappear and are replaced by blue and yellow signs on posts.
At last, you will enter the old town, through the Porta do Camiño, winding gently through the stone paved lanes, through the Plaza Cervantes, under the Bishops residence, and into the Plaza de Obradoiro. Congratulations, and welcome to Santiago de Compostela!