The voucher must be used on the selected date and within operating hours; Invalid after expiration • Children under 5 years old can participate for free. Proof of age is required (e.g. a passport)• Travelers under 16 have to be accompanied by an adult• Please visit the official website to check the operating hours before booking and select your preferred entry date when booking. Your ticket is only valid on the selected date • Hours may vary, and the observatory may close for private events. Please visit the official website for the updated hours. Dates and times are subject to change without prior notice • Please arrive earlier than your scheduled time to avoid any delays• Dates cannot be changed once the booking is confirmed• Travelers may be asked to present their ID documents (e.g. passport, ID card) for identity verification purposes. Please make sure you carry the aforementioned documents with you on the day of the visit