4Topkapi Sarayi, Turkey

Although it’s officially called a palace, Istanbul’s sprawling Topkapi compound bears all the features of a classic castle: defensible site, fortified walls, powerful gateways and a royal residence occupied by the Ottoman sultans from the late 15th century when it was originally constructed until the 1850s.   

Converted into a museum when the Ottoman Empire dissolved after World War I, the Topkapi offers extensive gardens, wall-top walks overlooking the Bosphorus, the Ottoman Imperial Harem where the ruler’s concubines resided and the Imperial Treasury with its famous emerald-encrusted golden dagger – stolen and eventually retrieved in the 1964 heist movie “Topkapi.”

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