Think you’ve got the ultimate man cave? Think again. That title goes to the luxurious, rugged masterpiece that is Casa Tierra.

Just outside the Spanish city of Córdoba, design studio UMMOestudio has created this glorious, 90-square-metre villa apartment built straight into a rock face. The earthy space is punctuated by wood, aluminum, limestone and marble – it feels like a five-star hotel designed for The Flintstones. Being right in the mountain also offers the benefit of a perfect indoor temperature of 18-20 degrees Celsius without any regulation. You’ve been out-caved.