Adult Coloring Book Cityscapes has 25 beautiful amazing cities around the world to color. Coloring books are not just for the kids anymore. In fact, adult coloring books are all the rage right now. It is a fun activity for many children and adults. It has been shown to have stress and anxiety reducing benefits. Coloring books can make you feel calmer, mentally clearer, happier, and more relaxed. You can use markers, colored pencils, gel pens, or pens for coloring. Each coloring page is on a separate sheet.