Cropmarks of a Neolithic long barrow, to the east of Poke Holes, Calcethorpe. Visible as a rectangular ditched enclosure, open at the northern end. Identified on aerial photography examined as part of the National Mapping Programme. {1}{2} The long barrow is situated on the tip of a spur, on the north facing slope of a valley of the tributary of the River Bain. It is aligned north-north-west to south-south-east, with the long axis running parallel to the contours. It is an enclosure of oblong form, measuring roughly 50m by 18m, and with the north end open. A possible spur may be visible on the western side of the interior. The ditches appear to be unusually broad. The barrow lies in close proximity to two Bronze Age round barrows (see MLI127013 and MLI127014) and a rectilinear enclosure (see MLI127016) to the north-west, and a further Bronze Age round barrow to the south-east (see MLI127015). {3}{4} The Neolithic long barrow, the three Bronze Age bowl barrows and the rectilinear ditched enclosure have all been scheduled, with a main group including the intervening ground covering most, and the southernmost barrow in a separate protected area. All of the features are visible as cropmarks on aerial photographs, showing as infilled and buried ditched features. Further features not revealed by aerial photography will also be preserved beneath the present ground surface. The fills of the ditches will contain rare and valuable artefactual and organic evidence, including human remains, relating to the construction, dating, periods of use and religious beliefs of the barrow builders. Environmental deposits preserved in the same features may illustrate the nature of the landscape in which the monument was set. The long barrow is a relatively unusual example displaying a U-shaped ditch thought to be indicative of abandonment before completion. The buried features and archaeological deposits contained therein may confirm this and will provide insights into the early constructional phases which are often obscured in more developed examples. Although the ditched enclosure cannot be dated, its location suggests a spatial relationship with the barrows. Its chronological relationship may be revealed by artefactual evidence from the interior, from the fills of its buried ditches and from the surrounding area. The proximity of the Bronze Age barrows to that of the earlier Neolithic long barrow suggests the location had enduring ritual significance. The long barrow is one of a group focussed on the prehistoric trackway now known as the Bluestone Heath Road, and on the valley of the Waithe Beck. Comparative evidence from all these barrows may have considerable significance for the study of communications, settlement and demography during the prehistoric period. {5} More recent analysis of the aerial photography for this area shows the long barrow as cropmarks and soilmarks, as an elongated rectilinear enclosure, orientated north-west to south-east and with maximum dimensions measuring 57.5m by 30m. The north-western end appears to have been truncated by a post-medieval chalk pit. Three possible pits are visible within the enclosure, with a further two outside, all of which may be associated with the barrow. The internal mound is partly visible as a compacted surface on air photographs, but is also visible as a low spread earthwork on digital elevation models derived from 2m gridded height data, with the ploughed down mound now having a broader footprint that the ditched enclosure. {6}{7}