Prague Castle is the most visited castle in the world. The massive complex is the largest castle in Europe and dates back to the 9th century. Château de Versailles or the Palace of Versailles is a grandiose castle outside of Paris that features ornate and lavish architecture and impeccable gardens.

As of the 2025–2026 tourism statistics, Windsor Castle in the United Kingdom and Neuschwanstein Castle in Germany remain two of the most-visited castles in the world. Windsor Castle, being the oldest and largest occupied castle globally, attracts millions of visitors annually who come to see the State Apartments, St. George's Chapel, and the Changing of the Guard. In 2026, the global "Castle Tourism" market is estimated to be worth $2.5 billion, with travelers increasingly seeking "authentic heritage experiences." Another massive contender is Edinburgh Castle in Scotland, which dominates the city's skyline and serves as a major hub for military and royal history. While the Forbidden City in Beijing or the Louvre in Paris often record higher total "palace" visitor numbers, for traditional European fortifications, Windsor remains the gold standard. In 2026, these sites have integrated more AR (Augmented Reality) and VR tours to manage the massive crowds while preserving the delicate historic structures. If you plan to visit any of these flagship castles, booking "timed-entry" tickets several weeks in advance is now a standard requirement to ensure access during peak travel seasons.