wooden door entrance of a casa-cueva in rural spain

wall terrain temple ruins rock monument monastery landmark history geology fortification formation column building arch casa-cueva cave house wooden door rural spain underground home spanish architecture earthen thermal insulation traditional rustic living countryside sustainable housing eco-friendly subterranean dwelling earth-sheltered orange earth historical heritage handmade stone walls remote village off-grid alternative hillside charm hidden scenic landscape nature-integrated warm climate countryside retreat earth-built cultural lifestyle craftsmanship adobe self-sufficient unique architectural history heat protection desert design simple old-world escape local traditions natural preserved time-honored living