Anyone visiting the Italian city of Naples won't have to walk far, before coming across a stunning church or beautiful monument.

But travellers who find the hustle and bustle of the heavily populated city starting to get to them can now see a whole new side of Naples.

Fiona Foster has been to see its 19th Century underground tunnels, which have just been opened up to tourists.

For more travel reports and features, visit the BBC's Fast Track website.