2. Stonehenge
We’ve all seen them. Large stones standing upright in the middle of nowhere in England. Why, who, how still remain a mystery. But scientists think they know at least when – 4 000 years ago.

Andrew Roland/Shutterstock.com
We’ve all seen them. Large stones standing upright in the middle of nowhere in England. Why, who, how still remain a mystery. But scientists think they know at least when – 4 000 years ago.
Andrew Roland/Shutterstock.com