The historic wall that once encircled the City of London has stood for nearly two thousand years. While time has transformed many sections, intriguing parts still linger around the Barbican area. These are predominantly Tudor, reflecting the maintenance work done over the centuries.
For those interested in the Roman origins of the wall, significant remains can be found in and around the Tower of London. These ancient stones whisper stories from the past and offer a glimpse into the city's storied beginnings.
Scattered around the city are other notable remnants of this historic fortification. The Noble Street wall fragment, located at coordinates 51.5169, -0.095833, stands as a testament to the wall's enduring presence. Nearby, the St Alphage Gardens wall fragment at 51.5177, -0.092234, also provides a tangible link to London's rich history.
Source - https://en.wikipedia.org/wiki/London_Wall