You would think that a city made of concrete might be quite brutalistic or ugly - but Le Havre is absolutely stunning. There is something about the way the architects have taken the plain blocks and give them texture and colour that is quite unique and plays with your senses in a delightful way.
The highlight of the visit is the cathedral and you must go inside to see the colourful displays you get when the sun shines through the windows. Many of the other public buildings and apartment blocks you can just enjoy from the outside while walking around.
It is possible to go inside an apartment that has been maintained in the same style as it would have been when Le Havre was first developed like this after the war. Unfortunately I wasn't able to do this myself because of a mix up with my booking but I hear that it is well worth it!