This aerial image of Cologne is from November 1944. The area to the west of the river, almost all coloured in dark blue, indicates the city centre.
Cologne ha… See more

The two images of Berlin show how much the city had suffered during World War Two.
The first shows north west Berlin in December … See more

This Blue Book image shows Dresden in March 1945, just months before the end of the war. The city centre can be seen south of the river - largely in blue.
Dresden ha… See more

This 1944 map of Hamburg was produced to show which areas of the city would burn the most easily, said Dr Chasseaud.
The fire hazard maps are coded red, for areas of hig… See more