Do I need to book tickets in advance for popular attractions like the Forbidden City or the Great Wall? What are their opening hours?

Yes, advance booking is highly recommended, especially during peak seasons (spring, summer, and holidays). The Forbidden City, for example, requires online reservations through its official website or authorized platforms, as on-site tickets are limited. Opening hours vary by season: the Forbidden City is usually open 8:30 AM–5:00 PM (closed on Mondays, except public holidays). For the Great Wall (e.g., Badaling, Mutianyu), tickets can be booked online or purchased on-site, but booking ahead saves time. Most sections open around 7:30 AM–5:30 PM.