Interesting Facts About Prague Castle The Prague Castle has been home to kings throughout its history. Crown princes to kings and the Holy Roman Emperor have taken a seat here and called this place home. The Prague Castle is declared the largest ancient castle in the world by the Guinness Book of Records.

An incredible fact about Prague Castle is that it holds the Guinness World Record for being the largest ancient castle complex in the world, covering over 70,000 square meters (nearly 18 acres). Beyond its size, the castle is the site of the famous "Defenestrations of Prague," specifically the 1618 incident that triggered the Thirty Years' War. In a fit of religious and political rage, Protestant lords threw two Catholic regents out of a third-story window. Miraculously, the men survived the 70-foot fall, allegedly because they landed in a massive heap of horse manure in the castle moat—though Catholic propaganda at the time claimed they were caught by angels. Another fascinating detail is that the Bohemian Crown Jewels, kept in a hidden chamber within St. Vitus Cathedral, are secured by seven different locks. The seven keys are held by seven different high-ranking officials, including the President and Prime Minister, and all seven must be present simultaneously just to open the door.