It seems that adult coloring books (no, not that kind) are a thing now. They’re even topping Amazon’s bestseller list. Ontario Canada-based artist Steve McDonald has created a timely coloring book for grown-ups called Fantastic Cities. The highly detailed architectural drawings provide both «real and imagined» views of New York, Amsterdam, London, and many more cities around the world. So, get out your secret crayon stash. The beautifully imagined book will be out on from Chronicle early this summer and can be pre-ordered right here.