1. The Potala Palace: Tibet’s greatest monumental structure
2. Mont Saint-Michel: a Medieval Castle on a Small Island
3. Predjamski Castle: Integrated in a Cave

4. Neuschwanstein Castle: the Classic Fairytale’s Castle

5. Matsumoto Castle: Japan’s most fascinating castle
6. Hunyad Castle: were Dracula was held prisoner

7. Malbork Castle: World’s Largest Brick Gothic Castle
8. Palacio da Pena: Oldest Palace inspired by European Romanticism
9. Löwenburg Castle: The Disneyland of the 18th century

10. Prague Castle: World’s Largest Ancient Castle

sumber: http://kaskusnews.com/2010/01/07/istana-istana-terindah-di-dunia/