1. The Great Wall of China – Disappearing Brick by Brick
Once a staggering feat of human will and engineering, the Great Wall is vanishing—right under our noses. Strong enough to be seen from space, yet vulnerable to storms, erosion, and even farmers stealing bricks for their homes.
In some areas, only crumbling earth mounds remain where watchtowers once stood. What took centuries to build may only take decades to lose.