embedded right into the foothills of sierra morena in spain, ‘casa tierra’ is carved right into the sloping strata of limestone that also forms the various geological features known to the cuevas del pino estate. inside the hidden cave retreat, the characteristics and rough texture of the calcarenite stone is apparent and celebrated throughout. the interior spaces are sculpted around this natural formation and the results is a strong sense of enclosure combined with spacious, natural light fi...