Stand anywhere near it and the ground looks entirely ordinary, grass running flat in every direction without a ridge or hollow to suggest anything lies beneath. Yet something does lie beneath, or rather, what remains of something that was once substantial enough to be recorded on the Ordnance Survey's six-inch map of 1837 as a circular enclosure roughly 35 metres across.

That 1837 map is the earliest firm documentation of the site, where it appears as a clearly defined circular plan. Enclosures of this kind are generally understood to be the remains of enclosed settlements, often of early medieval date, where a bank and ditch defined a domestic space around a house or small cluster of buildings. The monument at Middletown has since been levelled entirely, meaning the earthworks that once gave it shape above ground have been ploughed or otherwise removed over generations of agricultural use. What survives is visible only as a cropmark, a phenomenon that occurs when buried ditches and banks affect the growth of crops or grass above them, producing subtle differences in colour or height that become legible from the air. In this case, the cropmark reveals a circular area enclosing what appears to be a possible house site, with a larger outer ditch tracing the perimeter. The site was compiled by Geraldine Stout and later revised by Caimin O'Brien, working from an orthoimage of the field provided by Jean-Charles Caillère and visible on Apple Maps aerial photography, with the revision uploaded in January 2023.

For anyone curious enough to seek out the field, the honest expectation is that there will be little to register at ground level. The value here is not in what can be seen on foot but in the exercise of looking at the same patch of ground through different lenses, literally. Pulling up the Apple Maps satellite view while standing in or near the field allows the buried geometry to become suddenly legible, a circle emerging from what looks like featureless pasture. The site sits north of Middletown House, and the surrounding land is agricultural, so access would depend on landowner permission. The cropmark itself is most likely to read clearly in dry summer conditions, when differential growth is at its most pronounced.