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EU citizens aged 0-25 are entitled to have free admission tickets upon presentation of their ID or passport at the location. However, it is required for them to queue to receive their zero-value pass From 1st of April to 31st of October Non-EU citizens, between 6 to 25 years old, upon presentation of their passport, are entitled to 50% reduced admission. The same is applicable to senior citizens over 65 from Greece or other EU member states and the European Economic Area. However, reduced tickets do not have a skip-the-line privilege and will require the participants to queue to present their ID or passport at the location Free/reduced admission tickets do not have skip the line privileges and can only be acquired at the ticket booth on-site After booking, you will receive an email from the local supplier with your personal promo code and instructions for the audio tour Download the ticket(s) & audio tours while on WiFi prior to your visit - no wifi/4G on-site Your entry tickets will be emailed to you one day before your selected travel date. Please check your email spam folder as well An Android (version 5.0 and later) or iOS smartphone is required. The audio tour is not compatible with Windows Phones, iPhone 5/5C or older, iPod Touch 5th generation or older, iPad 4th generation or older, iPad Mini 1st generation The size for the app and the audio tour is 100-150 MB Be prepared to walk uphill and bring comfortable walking shoes, water, sunscreen, and a hat