Let's Explore Philadelphia is the twelfth book in young Zachary Malott's "Let's Explore" children's book series which he writes with his dad. It was the most challenging book for the duo to date on account of the abundance of things to see and do in the city, the city's diverse make-up of neighborhoods (referred to as districts), its extensive history, and a collection of American heroes based in "Philly" that changed the course of history.