After the abandonment of Tower Hill as a site for public executions, Trinity Square and Gardens were laid out in 1797 by
Samuel Wyatt as the setting for
Trinity House, completed a year earlier as headquarters of the
Corporation of Trinity House. In the 1880s, a section of the London Underground
Circle Line was constructed beneath Trinity Square Gardens. In the first decade of the 20th century small buildings, courts and yards bordering Trinity Square were cleared to make way for the construction of the Port of London Authority headquarters at
10 Trinity Square. Begun in 1912 and completed in 1922, the Grade II* building is now a Four Seasons hotel which opened as such on 26 January 2017. The
Merchant Navy Memorial, First World War section, Grade I-listed, was unveiled by Queen Mary (deputising for her husband, King
George V) on 12 December 1928. To avoid overshadowing this, the Grade II* Second World War section is in the form of a sunken garden and was unveiled by The Queen on 5 December 1955 while that commemorating merchant seamen killed in the 1982
Falklands War was unveiled on 4 September 2005 by the First Sea Lord, Admiral Sir
Alan West. ==Tower Hill Trust==