![Carnuntum fell into decline in the fourth century A.D., and now the city is largely hidden underground. So the archaeologists used non-invasive methods, like ground-penetrating radar, to peer under the surface.](https://cdn.mos.cms.futurecdn.net/NJDi2PieE9E9xLBxJTor9j-320-80.jpg)
Photos: A Roman entertainment district brought back to life
Archaeologists detected ancient shops and food stalls that would have served spectators outside of a big arena in Austria. And they have digitally recreated this Roman amphitheater called Carnuntum.