Entrance to Wayland's Smithy - a Neolithic long barrow tomb in Oxfordshire, England.
Dating from about 3500 BC this scan shows the reconstructed entrance to the tomb.
Wikipedia entry : https://en.wikipedia.org/wiki/Wayland%27s_Smithy
Location:
OS GRID - SU 28099 85365
What2Words: https://w3w.co/skimmers.replying.decay
Constructed from 130 still photos taken on 26.07.21