Source: Nick Caville Inside a restored turret with views over Whitehall. The spiral stair descends past a secret concealed floor, back to the main top floor of the building Westminster’s grand Old Admiralty Building is the backdrop to many of the nation’s most important ceremonial events. Its turrets and handsome red brick and Portland stone facades face both The Mall and Horse Guards Parade, scene of Trooping the Colour and the Olympic beach volleyball in 2012. This summer, on the 75th anniversary of VJ Day, the actor Hugh Bonneville clambered through a window while vintage newsreel was beamed across the facade.