The images in this series were collected on a walk on the Camino de Santiago in northern Spain. They were taken at various locations between Roncesvalles and Santiago de Compostela.
The scallop shell motif is one of the waymarkers that is used along the Camino. The scallop shell is said to be a metaphor, representing the routes starting at various locations throughout Europe and leading pilgrims to Santiago de Compostela, where the tomb of St. James is located.
In the first image, I found the shell appeared above the doorway and as a decorative item on the actual door.