One of Barcelona's most iconic landmarks, Park Güell is a UNESCO World Heritage site designed by Antoni Gaudí — and much of it is free to explore with your dog. While the ticketed Monumental Zone requires dogs to be kept on a lead and restricts access to certain areas (including the Nature Square, Dragon Stairway, and Hypostyle Room), the surrounding woodland and free areas of the park are open daily and offer a great walk with stunning views over the city. Dogs can be taken off-lead in the woodland area outside the regulated zone between 6am and 11pm, provided they remain under close supervision. No ticket is required for dogs in any part of the park. A brilliant, free option for a scenic morning or evening walk with your dog in one of Barcelona's most spectacular green spaces.