During the Second World War more than 116,000 men and women of the Air Forces of the British Commonwealth gave their lives in service. Approximately one-third of all who died have no known grave. Of these, 20,450 are commemorated by name on the Runnymede Memorial, which is situated at Englefield Green, near Egham, 32 kilometres west of London. The design of the Runnymede Memorial is original and striking. On the crest of Cooper's Hill, overlooking the Thames, a square tower dominates a cloister, in the centre of which rests the Stone of Remembrance. The cloistered walks terminate in two lookouts, one facing towards Windsor, and the other towards London Airport at Heathrow. The names of the dead are inscribed on the stone reveals of the narrow windows in the cloisters and the lookouts.