Addington Long Barrow

Addington Long Barrow is a chambered long barrow located near the village of Addington in the southeastern English county of Kent. Probably constructed in the fourth millennium BCE, during Britain's Early Neolithic period, today it survives only in a ruined state. Built of earth and about fifty local sarsen megaliths, the long barrow consisted of a sub-rectangular earthen tumulus enclosed by kerb-stones. Collapsed stones on the northeastern end of the chamber probably once formed a stone chamber in which human remains might have been deposited, though none have been discovered.

Archaeologists have established that the monument was built by pastoralist communities shortly after the introduction of agriculture to Britain from continental Europe. Although representing part of an architectural tradition of long barrow building that was widespread across Neolithic Europe, Addington Long Barrow belongs to a localised regional variant of barrows produced in the vicinity of the River Medway, now known as the Medway Megaliths. Of these, it lies near to both Chestnuts Long Barrow and Coldrum Long Barrow on the western side of the river. Two further surviving long barrows, Kit's Coty House and Little Kit's Coty House, as well as the destroyed Smythe's Megalith and possible survivals such as the Coffin Stone and White Horse Stone, are located on the Medway's eastern side.

After the Early Neolithic, the long barrow fell into ruins, with a small road being built through the centre of the monument by the 19th century at the latest. Local folklore grew up around the site, associating it with the countless stones motif. The ruin attracted the interest of antiquarians in the early 18th century, and was studied by local archaeologists in the 20th. Both it and the nearby Chestnuts Long Barrow are on private land and are no longer (as of October 2019) accessible to the public.

The monument lies approximately 250 metres (820 ft) north of Addington Parish Church. It is accessible from the A20 via two minor roads. The area in which the barrow is located is sometimes termed Addington Park. The site is privately owned, although it is visible from a road that cuts through the middle of the barrow. Geologically, it is located on the Lower Greensand.

The Early Neolithic was a revolutionary period of British history. Between 4500 and 3800 BCE, it saw a widespread change in lifestyle as the communities living in the British Isles adopted agriculture as their primary form of subsistence, abandoning the hunter-gatherer lifestyle that had characterised the preceding Mesolithic period. The change came about through contact with continental European societies, although it is unclear to what extent this can be attributed to an influx of migrants or to indigenous Mesolithic Britons adopting agricultural technologies from the continent. The region of modern Kent would have been key for the arrival of continental European settlers and visitors, because of its position on the estuary of the River Thames and its proximity to the continent.

Britain was then largely forested; widespread forest clearance did not occur in Kent until the Late Bronze Age (c.1000 to 700 BCE). Environmental data from the vicinity of the White Horse Stone, a putatively prehistoric monolith near the River Medway, supports the idea that the area was still largely forested in the Early Neolithic, covered by a woodland of oak, ash, hazel/alder and Amygdaloideae (stone-fruit trees). Throughout most of Britain, there is little evidence of cereal or permanent dwellings from this period, leading archaeologists to believe that the island's Early Neolithic economy was largely pastoral, relying on herding cattle, with people living a nomadic or semi-nomadic life.

Across Western Europe, the Early Neolithic marked the first period in which humans built monumental structures in the landscape. These structures included chambered long barrows: rectangular or oval earthen tumuli that had a chamber built into one end. Some of these chambers were constructed out of timber, while others were built using large stones, now known as "megaliths". These long barrows often served as tombs, housing the physical remains of the dead within their chamber. Individuals were rarely buried alone in the Early Neolithic, instead being interred in collective burials with other members of their community. These chambered tombs were built all along the Western European seaboard during the Early Neolithic, from southeastern Spain up to southern Sweden, including most of the British Isles; the architectural tradition was introduced to Britain from continental Europe in the first half of the fourth millennium BCE. While there are stone buildings—like Göbekli Tepe in modern Turkey—which predate them, the chambered long barrows constitute humanity's first widespread tradition of construction using stone.

Although now all in a ruinous state, at the time of construction the Medway Megaliths would have been some of the largest and most visually imposing Early Neolithic funerary monuments in Britain. Grouped along the River Medway as it cuts through the North Downs, they constitute the most southeasterly group of megalithic monuments in the British Isles, and the only megalithic group in eastern England. The Medway Megaliths can be divided into two clusters between 8 kilometres (5.0 miles) and 10 kilometres (6.2 miles) apart: one to the west of the River Medway and the other on Blue Bell Hill to the east. Addington Long Barrow is part of the western group, which also includes Coldrum Long Barrow and Chestnuts Long Barrow. The eastern group consists of Smythe's Megalith, Kit's Coty House, and Little Kit's Coty House, while various stones on the eastern side of the river, most notably the Coffin Stone and White Horse Stone, may also have been parts of such structures. It is not known if they were all built at the same time, or whether they were constructed in succession; nor is it known if they each served the same function or whether there was a hierarchy in their usage.