hadrian ‘s wall, the northern most pa rt hadrian ‘s wall, the northern most part of the roman empirer away and expose the foundations. they have had to act, bring in helicopters and 35 ton of rock to try and rebuild. let's be to some of the people who can tell me more about the wall and what is being done. tony, you are from northumberland national park authority. visitors come here in the tens of thousands each year. you have seen a rise. yes. there has beena have seen a rise. yes. there has been a modest rise of the last few years which is a good news story, really. we have had about 3% increase in tourism across the county. we see about a million visitors a week here. that is incredible. and as you said it is a good news story and we do want to see more people visiting. at the same time, however, if it is doing damage, what can be done to prevent that? the very thing that the national trust are doing in bringing stone in and putting a path, this is historic damage. the damage has been there for 20 years. nowadays we know a little more. we have a national trail which the national p