10 Unsolved Historical Mysteries That Still Confuse Experts

8. The London Hammer

In 1936, people in Texas found a hammer stuck inside a rock. The weird thing? The rock was 400 million years old, way before humans existed.

The hammer’s head was made of super-pure iron, even better than what we make today. How did a modern-looking tool get trapped in ancient rock? Time travel? Lost civilization? It’s a mystery that scientists can’t solve.