A magnetic nano- not in anyone's garden.
There are several sections of the Roman Wall across Lincoln, and this was a section off the main tourist strip that I feel is well worth checking out. It's a peaceful walkway which takes you directly from the North Tower of the East Gate of the ancient wall (close to the Cathedral), to the Newport Arch (another Roman feature). Look for the Roman wall and reservoir visible in gardens as you walk along.
It's generally a quiet road, but possibly could get busy at times. It's my first 'hide' so I've tried to keep this one simple- TRY NOT TO BE SEEN WHILE SEARCHING.