“Vast 5,600-year-old religious centre discovered near Stonehenge”

There’s still so very, very much that we don’t understand (and may never understand) about the ancient world:

http://www.independent.co.uk/news/science/archaeology/stonehenge-prehistoric-religious-ceremonial-centre-discovered-archaeologists-a7425346.html

This is a pretty dramatic discovery in a quite populated, heavily studied, and very familiar area.