No tickets are required for open attractions. It's a place where you can soak all day and feel like it's not enough. When visiting, you can choose to buy a guided map: 2 pounds per copy, or rent an interpreter: 5 pounds per platform; if you are traveling with a group, you can ask the tour guide to make an appointment with the instructor: 20 pounds per person. This time when I went, my mobile phone had a pocket guide app recommended by my friend, which could be used by my freelance friends. If you're not prepared for anything, you can't even find the direction. The commentator is about its freedom of movement, where to go, where to choose, where to hear, and if it is ready to fight a protracted war, it is a good choice.