OK, the London wall is really confusing at first unless you look at it from space, e.g. from google earth. It is how I discovered it in the first instance.
What is even more confusing is the depth of some of the streets from the actual wall. If you just walk along Coopers row, and then try to make a straight line to America square, it does not make sense. Then if you look at the following it does make sense:
Notice Coopers row on the left, near the bottom, but it is in fact quite a distance away from the actual line of the Wall. This wall then disappears underneath Fenchurch station,and reappears in America square, underneath a conference building.
A mapping of the area is always good, modern day compared to pre-1900 maps from the NLS site
The original references from the London wiki site are as follows:
In 1908 the demolition of Nos 15 and 16 America Square, revealed a stretch of about 65 feet of the wall.
If you peer into the floor level sky-lights down into the conference centre, you an just make out a section of the wall. this near to the corner of the building.
Here is a far better description, than I could ever envisage, with lots of pictures inside the building, too. Although, this is a picture taken in 1905 of the original walled section inside Roman Wall House
The line of the Roman wall then continues northwards and is partially found in the school originally called James Cass, but renamed to some extent after the Black Lives Matter highlighted John Cass as a prolific slaver.
The paperblog managed to photograph inside this building in the past when it was part of the London Met.
Just a little further north, and along Jewry street, very close to Aldgate was a section of the wall which is actually in the cellar of the original Three Tuns, 36 jewry street. This pub backs onto Vine street (previously called Little George street).
At Aldgate, as was, the Roman wall turns north east along Duke street. In 1887 a section of wall was seen here in the widening of this street, most of which is now completely gone, although as you walk along the same steps on the map, you will be in Dukes place, which is the northern section before joining Bevis Marks.
Just to clarify, and keep you in a straight line, the wall follows in parallel within Houndsditch which still exists today as a highway rather than a ditch!