London's landmark Old War Office building has seen many avatars. It used to be the site of the original Palace of Whitehall - home to monarchs between 1530 - 1698. It has been Winston Churchill's headquarters during WWII. The Grade II listed heritage property with secret tunnels saw Churchill strategise war moves with armed forces and spies. It was also the filming location for several Bond movies, and The Crown series on Netflix.. It has been closed to the public for more than a century. But now it is undergoing a massive restoration with EPR Architects working to transform the building into residences and the first Raffles hotel in London.