Buckingham Palace

Buckingham Palace is a major site and head Command Centre in London, England as an Allied faction in defeating the Soviet Union during the Great World War II in Europe leading up to the first Command & Conquer game.

In real life, it is home to the monarchy, either King or Queen and currently to live in the building is Queen Elizabeth II who was crowned Queen in 1953. The residence to her as Queen appears in the end of Command & Conquer: Red Alert which suvived the event of Soviet Premier, Josef Stalin.

The Ending of Great World War II
As the Allies won against the Soviets in Moscow, the Soviets won their own way by destroying Allied forces in London and the invasion of England was successful. At the ending of the Soviets' GWWII missions, their forces captured Buckingham Palace to have the Soviet Commander as their new leader and in there, Stalin reported to the commander to become his new leader, while drinking a cup of tea.

As he drank his tea, Stalin didn't know that the drink had poison in it. His loyal commander, Nadia chose her choice to gun Stalin down as the poison goes down his neck and she said that the Brotherhood of Nod has risen up but Kane, Stalin's advisor had shot her in the back and told the Soviet Commander that Nadia isn't the leader of the Brotherhood but he is the one behind Stalin's back to create Nod as a superpower, while GDI is created by the UN.

This lead to the first Tiberium game of Command & Conquer with GDI and Nod rising up including Kane as Nod's leader for the Tiberium War while GDI needs their own government.