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Due to the festive season, I have not had time to research anywhere in particular so I have had a trip through the northern part of the Sierra Mountains, on a round trip from Oria through Cullar, then a through various Puablo´s including Orce, in the province of Granada, then back to Oria.

There are a lot of cave houses in Spain, these houses have
a front made from normal building materials and the inside is hewn out of rock, they are the same temperature all the year round cool in summer and warm in winter.