If you're an adult colorer looking for some advanced templates to challenge you, then break out the colored pencils because here are 25 free printable coloring pages for adults!

Adult coloring books are displayed at a Barnes and Nobel store in New York on January 15, 2016.Coloring books are no longer just for the kids. Adult coloring books are all the rage right now.

A new coloring book pokes fun at reckless tourists in national parks, showcasing their wild antics with whimsical ...