Cross over the road and be not careful and you will fall into The Hole of Horcum! (I must remember that one to frighten the kids or put a curse on a Duchy).
We were careful and made it to the bottom of the hole, then along it, up and around the other side of it. You'll just have to look at the map to see the easy route we took.
I wouldn't like to guess which is the oldest - the bridleway running generally north east from Levisham and partly alongside The Hole (the very same that we trod yesterday) or the dikes that abut it. However, the dikes were constructed about 2000 years ago. In awe, silenced and humbled, I took shelter there, reverently, trying to take in the enormity of two--thousand--years! Which was very tiring so I polished off my cheese sandwiches and hot chocolate.