Plaque (lost): Tower of London execution site - c.1910
Site of the scaffold on which were executed Queen Anne Boleyn, Queen Katherine Howard, Lady Jane Grey & others.
Site: Tower of London execution site (3 memorials)
EC3, Tower Green, Tower of London
Members of royalty sentenced to death were spared the ordeal of public execution on Tower Hill. This spot, inside the very secure Tower of London, was reserved just for them, and apparently the executions took place under cover. Excavations have confirmed the existence of a building here.
2017: Within a few weeks we came across not just one but two predecessors to the glass cushion which has been here since 2006. We're being very nerdish, publishing them as 'lost' memorials, even though the current location of one of them is actually known.