For thousands of years, the story of human architecture has been a race to the sky. From the Pyramids of Giza to the Burj Khalifa, we equate progress with altitude. We build up to escape congestion, to capture light, and to showcase our engineering dominance. But what if we have it backwards? As our cities become heat islands, as space runs out, and as the climate becomes more volatile, the next great frontier in architecture might not be the clouds. It might be the crust. To