Mostly Norman but there are some Roman remains.
The Roman wall of London is the wall of the Roman city of Londinium. London was founded by the Romans. Archaeologists have found some remains.
This is a really difficult question to answer because no-one really knows who first settled in the area, or exactly when. The White Tower, which is in the middle of the Tower of London, dates from 1078 so is one of the oldest buildings in London. The oldest structure is probably London Wall, which dates from the Roman times, and parts of it are still standing, notably adjacent to the Tower of London.
Yes
Stonehenge, Tower of London, Hadrian's Wall.
King Edward the First
Stonehenge, Tower of London, Hadrian's Wall.
The original City of London was situated behind the Tower which is adjacent to the River Thames. A defensive wall, which started and finished at the Tower, surrounded the city. It was assumed that any attack would be launched from the river because an invading army would have to cross the North Sea to get to England. An invasion from the South would find that the river was a natural barrier and could easily be defended from the Tower. There have been fortifications on the site for at least 2000 years.
There is no gun tower on the Berlin Wall
The London Wall was first built by the Romans.
Yes. It was called "London Wall".
Walle
A flanking tower is a tower built into a fortified wall which allows the defenders to shoot across the wall.