This Romanesque hermitage looks as if it had been left behind by some remote order of hermit-monks who meant to take it on a picnic in the Pyrenees. The tiny chapel, possibly—along with Sant Llàtzer—Barcelona's smallest religious structure, was originally built in the 12th century on the main Roman road into Barcelona, the one that would become Cardo Maximo just a few hundred yards away as it passed through the walls at Portal de l'Àngel. Bernat Marcús, a wealthy
merchant concerned with public welfare and social issues, built a hospital here for the poor. The chapel today known by his name was built as the hospital chapel and dedicated to the Mare de Déu de la Guia (Our Lady of the Guide). As a result of its affiliation, combined with its location on the edge of town, the chapel became linked with the Confraria del Correus a Cavall (Brotherhood of the Pony Express), also known as the troters (trotters), and for two centuries (13th and 14th) made Barcelona the key link in overland mail between the Iberian Peninsula and France.
Carrer Carders 2, (Placeta d'en Marcús), Barcelona, Catalonia, 08003, Spain