Shedding light on the Catacombs of Rome

Rome's underground Christian, Jewish and pagan burial sites, the Catacombs, date back to the 2nd Century AD.

There are more than 40 of them stretching over 170km (105 miles).

But, until now, they have never been fully documented, their vast scale only recorded with handmade maps.

That is now changing, following a three-year project to create the first fully comprehensive three-dimensional image using laser scanners.