"Why did ancient civilizations stop building in stone? Imagine spending months, maybe years, helping move one stone. No engines. No steel cranes. No guarantee you'll live long enough to see the job finished. And when that stone finally reaches its place, it isn't part of a house or a bridge or a fortress. It's a monument, something your grandchildren might still be building after you're gone. Now pull back, Britain, Malta, Egypt, Peru, Micronesia, Zimbabwe, France, Turkey, different worlds, different centuries, same impossible ambition. They raised giant stones, carved them, lined them up with care. And then, in so many places, they stopped. Not because they forgot. Not because stone disappeared. Because something changed. This isn't really about rocks. It's about what people trusted to outlast time. And once you understand why they built these monuments, you'll begin to see our own civilization differently."