The Churchill Museum and Cabinet War Rooms are two separate museums on one combined ticket. The Cabinet War Rooms were used by Prime Minister Winston Churchill during World War II. Up to three metres of concrete slab protected the Cabinet as they met over 100 times in the bunker. Some of the rooms have been opened to the public since 1984, and the Imperial War Museum now manages the site.

Originally the site covered 3 acres underground, and housed 528 vital staff who ran the hospital, shooting ranges, a canteen and dormitories. The most important room is the Cabinet Room, and the Map Room from where the war was directed. The Museum has kept the rooms just as they were more than 60 years ago, with maps on the walls, and old-fashioned telephones on the desks.

Churchill only used his underground bedroom for 3 nights during the 6 years of war. In his lavatory was a telephone scrambler on which Churchill liaised with President Roosevelt in the White House. In 2003 a further collection of 9 rooms was opened to the public, known as the Churchill Suite.

The separate Churchill Museum documents Churchill's private and public life and was opened in 2005. An interactive display, the world's largest, called 'The Lifeline' covers the events of Churchill's 90 eventful years.