I guess I'm here doing research for my adventure so I am supposed to ask, so here goes: What are they? Are they outhouses/necessaries? Or are they shrines??? I have no clue!
They are called horreos and are used to store grain, potatoes. You see them throughout Galicia and Northern Portugal. They have become iconic and locals sell models and drawings, paintings, etc. to tourists. It is my understanding that they are also being purchased and moved to decorate yards and for storage in other areas.
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon