People record the last bell bong at Elizabeth Tower in London, Monday, Aug. 21, 2017. At noon, Big Ben's famous bongs sounded for the last time before major conservation works are carried out. The Elizabeth Tower, home to the Great Clock and Big Ben, is currently undergoing a complex programme of renovation work that will safeguard it for future generations. While this vital work takes place, the Great Bell's world famous striking will be paused until 2021 to ensure the safety of those working in the Tower.(AP Photo/Frank Augstein), APTOPIX

Elizabeth Tower (Big Ben) is seen at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

Elizabeth Tower (Big Ben) is seen at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

Elizabeth Tower (Big Ben) is seen through scaffolding at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

People photograph Elizabeth Tower (Big Ben) in Parliament Square at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

Elizabeth Tower (Big Ben) is seen through scaffolding at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

Elizabeth Tower (Big Ben) is seen through scaffolding at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

People photograph Elizabeth Tower (Big Ben) in Parliament Square at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL

People photograph Elizabeth Tower (Big Ben) in Parliament Square at the Houses of Parliament in London on August 21, 2017 ahead of the final chimes of the famous bell before renovation works begin. Britain's Big Ben bell fell silent on August 21 for four years of renovation work, with its final 12 bongs ringing for midday in front of a crowd of over a thousand people. The repair work on the landmark looming over the Houses of Parliament in Westminster has sparked protests including from Prime Minister Theresa May. / AFP PHOTO / BEN STANSALL