maps, caves and Keith Ramsbottom

Been busy researching all things Roman for my upcoming Keith Ramsbottom series and I've just realised the need for a map. Haven't used/needed one in a book before but I think I will here.
Got me to thinking how maps, like letters, are one of the casualties of the digital Age. Yes, there are plenty out there but if something doesn't have a Net 'presence' it doesn't exist. The fun thing is, I've found a cave- a real one- that doesn't exist at all online & I'm going to put it in the sequel, currently residing in my head under the snappy title of The Emperor Strikes Back.