Brane Barrow sits 290 metres southwest of Brane End Farm, near a low-lying patch of pasture close to the upper Lamorna River. The mound is a circular cairn of earth and stones about 20 feet across, retained at its edge by a kerb of large granite blocks. Inside is a single rectangular chamber, lined with stone slabs, that measures 7.5 feet long, 4 feet wide and 3 feet high. Two granite capstones still roof the chamber; a third was prised off and removed at some unknown date. An entrance passage faces southeast, opening directly into the chamber from the kerb. Most entrance graves of this type were built up to 25 metres across. Brane is barely six. The mound was constructed only just thick enough to cover the chamber, and on the south side a section has been dug away, exposing the slabs directly to the weather. It looks less like a monument than like something the landscape itself shrugged up.

Entrance graves of the Scillonian type date to the later Neolithic and Bronze Age, roughly 2500 to 1000 BC. They are characteristic of a small zone of western Cornwall and the Isles of Scilly and almost nowhere else. The basic recipe is consistent: a low circular mound of rubble and soil, a stone kerb to hold it in, and a single chamber accessible through an opening in the perimeter, used for collective deposition of cremated remains and grave goods over time. Brane Barrow's combination of survival and miniaturisation makes it unusually informative. You can stand at the kerb and take in the whole monument in a glance. You can also see, from the way the slabs are set and the cap stones balanced, that the builders knew exactly what they were doing. This is not a hasty grave. It is a small, carefully made house for the dead.

The barrow was formally recorded in 1863 by William Copeland Borlase, a Cornish antiquarian following in his great-grandfather's footsteps. Borlase was actually in the area to investigate the underground passages of Carn Euny, the nearby Iron Age fogou and courtyard-house village. He noted the barrow as the one near Chapel Euny, after the local farmstead. The owner of the land told him what every archaeologist hopes to hear and rarely does: the structure had been left undisturbed because it was useful. The stone-lined chamber made a snug, dry shelter, well-suited to penning livestock through bad weather. That casual utility had probably preserved Brane through centuries while neighbouring monuments were dismantled for field walls or quarried for road metal. Borlase published the discovery in his Naenia Cornubiae in 1872, and the barrow has been a protected scheduled monument ever since.

Today Brane Barrow can be visited with permission from Brane farm. There are no information boards, no fences, no ticket office. You walk down a Cornish lane between high hedge banks, past granite gateposts and clumps of foxgloves, and the barrow appears in a paddock looking, if anything, like an unusually tidy heap of rocks. The Lamorna River chatters not far away. The fogou at Carn Euny is only a short walk further on. From the air the site is barely a freckle in the green Penwith landscape, but on the ground, kneeling at the small entrance and peering into the chamber, you are looking through a door that someone propped open more than three thousand years ago and that one west Cornish farmer, in 1863, was thoughtful enough not to close.