In February 2022 the owner of 100 Castle Road contacted the Society and draw our attention to the presence of a stone structure found within the ground floor during building works. The owner thought that the structure may be a fragment of the town wall. However, as the course of the Newborough defences in the vicinity of the site is well known to be on the opposite side of Castle Road, evidence being in both the surviving fragment of wall in the nearby car park and early mapping, it was clear that the structure could not be the town wall. However, it did appear, very unusually, to be a lime kiln within a building which is of interest so carried out investigations and survey. The Limekiln is probably late 18th century but in the early 19th century, after it had gone out of use a building was erected in front of it the kiln face being kept as a retaining wall.

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Below is a 3D scan of the limekiln: