View of Belas Knap, a Neolithic, chambered long barrow atop Cleeve Hill near Winchcombe, England.  The barrow was constructed around 3000BC, with successive burials over a period of years w/ the burial chambers deliberately blocked.  Excavations in 1863-1865 revealed skeletal remains of five children b/w 6 months to eight years of age.  Other artifacts were recovered & an excavation in 1963 revealed the remains of 38 human skeletons.  This is the north view showing the false portal entrance.

More info here: https://en.wikipedia.org/wiki/Belas_Knap