What is Stonehenge?
Out on a wide, grassy plain in southern England, a circle of giant stones stands against the sky. Some stones weigh as much as four elephants. Some are stacked like doorways. They've been there for about 4,500 years — older than the pyramids of Egypt — and no one wrote down why they were built or how people moved them. So we've been detective-working ever since.
The stones aren't from around here. The biggest ones — called sarsens — came from about 15 miles away. Each one weighs around 25 tons. The smaller bluestones came from Wales, 140 miles to the west. People moved them without trucks, without wheels (wheels hadn't been invented yet in Britain), probably using wooden rollers, ropes, and hundreds of people pulling together. It would've taken years.
