It runs along a busy roadway parallel to the Red River in Hanoi for 4 miles and it is spectacular. Nobody at the hotel knew what we were talking about, although I’d bet the people we asked had driven along it on their scooters many times. We had a cab drop us most of the way along the wall and we walked along it in the other direction.
At one point we stumbled into a morning produce market on the other side of the wall, vendors all around with heaps of veggies and fruit. In many places it was like the other side of the wall was a whole different world of hole in the wall businesses and residences.