Horn Core pit at London's Prescot St. via lparchaeology
I found a curious picture at deconcrete.org. It´s a mediaeval pit made of horns, as a kind of architecture without architects.
¨After the Romans settled in today’s London, Aldgate surroundings (eastwards from the city wall) were turned into a cemetery. But in the Post-Medieval period, Prescot Street was transformed from an essentially rural situation on the fringe of the City, into a densely populated central district. Among the on-going archaeological excavations at this site, a horn core pit has been discovered, showing the intense industrial activity in the area.¨