The presidential guards change hourly at Prague Castle. The best ceremony is at noon when throngs of people press along the First Courtyard fence to witness the formation and subsequent parade. Afterwards, tourists fan out into the castle complex to explore the numerous churches, palaces, towers, halls, historic buildings and gardens. Your options are to purchase a two-day pass or tickets for a long or short tour. Regardless of your choice, you will be amazed at this incredible UNESCO World Heritage Site.