Coldrum Longbarrow

The Coldrum Long Barrow, also known as the Coldrum Stones and the Adscombe Stones, is a chambered long barrow located near the village of Trottiscliffe in the south-eastern English county of Kent. Probably constructed in the fourth millennium BCE, during Britain's Early Neolithic period, today it survives only in a state of ruin.

Archaeologists have established that the monument was built by pastoralist communities shortly after the introduction of agriculture to Britain from continental Europe. Part of an architectural tradition of long barrow building that was widespread across Neolithic Europe, the Coldrum Stones belong to a localised regional variant of barrows produced in the vicinity of the River Medway, now known as the Medway Megaliths. Of these, it is in the best surviving condition.

Source: Wikipedia