It must be the romantic in me that brings me back to this ancient and oft travelled road whenever I visit Rome. You could spend weeks walking along this stretch of highway dating back to 312 BC and referred to as “the queen of the long roads”. You can still see grooves worn in the stones by years of chariot traffic. While I highly recommend you visit I also highly recommend that you plan your visit as there are many options and you can end up frustrated, tired, and dusty if you wing it. Generally I recommend 2 to 3 hours actually walking along the Appian Way not including getting to and from the park. This will leave you time to tour one of the Catacombs that allow visitors.
Below are some good links to help you plan to enjoy this amazing park and make the most of your visit.