Coneybury Anomaly - Credit: Wikimedia Commons
The Coneybury Anomaly is a pit with animal and other refuse, interpreted as the remains of a cross-cultural feast, within the Stonehenge Landscape in Wiltshire, England. It was not apparent on the ground and was discovered in the 20th century by geophysical survey. Excavation has produced a large amount of early Neolithic pottery together with a large quantity of animal bone, and flint tools of both Mesolithic and Neolithic types. Read more on Wikipedia
Source: en.wikipedia.org