This is not to be confused with the Royal Air Force Memorial in London. This is outside London in Runnymede (near Windsor), where the Magna Carta was signed.
The Air Force Memorial is a beautiful building atop a hill with sweeping views of the countryside. A simple rectangular building, the walls have the names of over 20,000 men and women from various countries who died flying in World War II. These people have no known graves. Friends and family leave little notes and flowers all over, and the whole area has a hushed and reverent tone to it.
There is a little flat roof you can climb up to for spectacular views of the winding Thames, Windsor, and Heathrow. On a clear day, you can even see some London landmarks.