Some buildings are basically geology experiments that people decided to live inside. Not wood, brick, or concrete—but walls grown from mushrooms, blocks made from salt, façades that literally breathe, and “stone” you can cast like plastic.

In this video, we’re counting down 15 weird building materials that are real, used in real projects, and often solve very practical problems like heat, humidity, weight, or waste. Some look normal from far away—until you realize what they’re actually made of. For more content like this one follow us also on Facebook, Pinterest or Instagram!