This underpass is where Horsingdon Lane crosses the Grand Union Canal at the foot of Horsingdon Hill. Just visible on the wall of the underpass is what appears to be a curious piece of graffiti, delineating a series of interlocking symbols in an unknown language or as-yet-undecipherable system of signification.
There is nothing else remarkable about the underpass - other than the curious fact that the publicly-available records of Horsingdon Council's Department of Highways and Infrastructure have rigorously documented the existence of this piece of graffiti since the late 1960s, noting that it has consistently resisted multiple attempts at removal. Exactly why this fact has been recurrently noted in the archives is unclear - but it is certainly the case that, throughout the decades, employees on the Highways and Infrastructure team have received regular complaints regarding the unsightly scrawl, and have, for some reason, treated its erasure as a priority.
Whether this has anything to do with rumours concerning the not-insignificant number of people who, over the years, have apparently gone unaccountably missing in the vicinity of the underpass, the archives fail to record.