The Guinness Book of Records claims that Prague Castle is the largest ancient castle in the world and its magnitude is certainly astonishing. Spanning a length of 570 metres, the complex is over seven times the size of a football pitch. The area containing the castle, however, spans 45 hectares.

Yes, according to the Guinness Book of World Records, Prague Castle is the largest coherent ancient castle complex in the world. It occupies a staggering area of almost 70,000 square meters (roughly 750,000 square feet) and stretches about 570 meters in length. Founded in the late 9th century, the complex is not a single building but a massive fortified enclosure containing a diverse array of palaces, halls, gardens, and churches, most notably the gothic St. Vitus Cathedral. It has served as the seat of power for Kings of Bohemia, Holy Roman Emperors, and currently, the President of the Czech Republic. In 2026, it remains the most visited tourist attraction in the country, drawing millions of visitors who come to witness the "Changing of the Guard" and explore its 1,100 years of architectural history. While other structures like Windsor Castle or the Malbork Castle in Poland are also massive, Prague Castle holds the record specifically for being the largest ancient castle complex that has remained in continuous use as a seat of government and royal residence.