Yes, you can walk around the exterior grounds and courtyards of Dublin Castle for free, as they are considered public spaces. You are welcome to explore the Upper Yard (the main courtyard), the Lower Yard, and the beautiful Dubh Linn Gardens, which sit on the site of the original "Black Pool" that gave Dublin its name. These gardens are a popular spot for both locals and tourists to relax and admire the view of the castle's Record Tower—the last remaining intact medieval tower of the original 13th-century structure. While the grounds offer a wealth of photo opportunities and historical markers, entering the State Apartments and the Chapel Royal requires a paid ticket. In 2026, these guided or self-guided tours provide access to the ornate rooms where presidential inaugurations take place and the historic Viking excavation site beneath the castle. However, if you are on a budget, you can still visit the Chester Beatty Library, which is located on the castle grounds and offers free admission to its world-class collection of rare books and manuscripts, making the Dublin Castle complex a highly accessible historical hub for all visitors regardless of whether they choose to pay for the internal palace tour.