You've heard of Stonehenge. It's that big rock circle over in England. But there's a lot more to it than that, and researchers have been studying it for centuries. From the people who lived near it to how and when it was made, here are...

Stonehenge, an ancient monument in England's Salisbury Plain, has puzzled historians for centuries. Built over thousands of years, its purpose remains a mystery, with theories ranging from a temple to an observatory for studying the...