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This strange looking cabin is a granary which is supported on stone/concrete pillars shaped liked toadstools. The toadstool shaped pillars not only keeps the rodents away but also protects the grain from moisture. Slits in the stone acts as ventilation.
Such granaries known as Hórreo in the Iberian peninsula were in use from as early 13th century and the oldest existing dates back to 15th century. Several thousand such granaries exist even today in the Peninsula.
The Hórreo shown above is located in small village of Vilar de Oute, Outes, Corunna, Galicia, Spain.