For the past 15 years, comic book shops around the country celebrate the genre by offering free comic books to customers the first Saturday in May every year.

The day is called "Free Comic Book Day," and with comic book characters dominating the movies box office and taking over pop culture, now is a perfect time to dive into comic books for the first time, or reignite your passion.

Comics nowadays are not only reserved for superheroes wearing spandex. But encompass a large selection of topics and genres, from Syfy, to horror, western, political drama, zombies, social issues and so much more. The writing is top notch with gorgeous artwork. Many of the writers of your favorite movies and television programs got their start writing comics and still do to this day.

Comics are not just for kids, and they haven't been for some time. If you're looking for some good books to get you started, I would recommend Marvel's Civil War, The Watchman, and Y The Last Man. The Watchman is listed as one of the 100 Best English Novels by Time Magazine, Y The Last Man is one of the best written and drawn graphic novels ever and Civil War is the basis for the next blockbuster Marvel movie, Captain America: Civil War.

To help celebrate free comic book day, the first Saturday of May, here are the 5 best comic book shops in Northern Colorado.