This map was produced to guide German bomber pilots to their targets in the Second World War. This particular map shows details of the area around Liverpool - an important target because of the docks and industry there.

The colouring of this map might seem rather strange to the eye, but that is because it was made to be luminous. The German airmen on a raid to bomb Liverpool would have needed to be able to see it in the dark, as this is when most of the bombing took place. They certainly didn't want to give their position away to the British anti-aircraft gunners by having a light on in their plane!

As the planes were travelling fast, the map had to be very clear, with the main features easy to see from what was basically a 'bird's eye' view. The key at the bottom is very important as it identified the targets for the bombers to try to hit.