Most people have never heard of the Callanish Stones, a prehistoric stone circle that stands on a remote hilltop on the Isle of Lewis in the Outer Hebrides, Scotland. But they’re older than Stonehenge and even the pyramids. Built around 5,000 years ago, the main circle is made up of 13 stones arranged in a near-perfect ring, with a tall central monolith and lines of stones stretching out like a cross. At its heart, archaeologists discovered the remains of a chambered tomb, used for centuries aft