Britain’s Imperial War Museum has produced a striking animation of the ‘strategic bombing campaign’ in Europe during the Second World War:

If the YouTube link (above) doesn’t work in your region, try this.  I can’t find any version on the IWM website – this version originates with the Daily Mail here – but an interactive version will be available to visitors at the reopened American Air Museum in Britain (at IWM Duxford) from the weekend.  The first bombing mission by the USAAF took place on 29 June 1942 against the Hazebrouk marshalling yards.