In Cadiz Alberto Campo Baeza built a house that is a Roman travertine podium crowned by an upper horizontal plane.
To materialize this elevated horizontal plane, which is the main living room of the house, he built a large box with 20 meters of frontage and 36 meters deep. And under those first 12 meters he excavated two floors in the solid rock to develop the whole living space.
To give force to the platform the architect incorporated all the terrain as far back as the entrance wall separating us from the street, also done in Roman travertine. Once inside the wall, the entrance to the house is via a “trench” in the form of stairs dug into the upper surface of the platform.
http://www.domusweb.it/en/architecture/2014/07/18/house_of_the_infinite.html