Heerlen in the Netherlands is the place I grew up in. I will not lie, it is a hideous city with more gray colors than others. Although the city has been working on its image of a former coal mine city. There is a lot of empty stores in the city center which is not appealing at all (still, in the neighboring cities and villages you will find enough nature). To make the city look a bit more colorful graffiti has been used to cheer up the streets. Can you spot them all in your visit?