When I think of Camelot, I think of the castle in France where we film, but I think it's wrong to lock it down to one place because it's all part of our imagination. They are legends for a reason. Their stories have endured for hundreds of years and, hopefully, they will for hundreds of years to come.
The big, big block in the Arthur/Merlin friendship is the status issue, that Merlin is the servant and Arthur is royalty, and in that time, princes did not socialize with their servants; that wasn't the done thing. It just so happens that their relationship, their friendship, is strong: they have been through the thick and the thin of it all.