Yedikule fortress in Istanbul.

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The fortress of Heptapyrgion (Yedi Kule) in Thessaloniki.

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The Golden Gate (Altınkapı) in Yedi Kule fortress (Heptapyrgion).

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View of Yedikule fortress in Istanbul.

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Inner courtyard of Yedikule fortress (Heptapyrgion) in Istanbul.

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Golden Gate in Yedikule fortress (Heptapyrgion), Istanbul.

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View of Yedikule Castle on the shores of the Sea of Marmara, Istanbul.

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The Yedikule fortress (Heptapyrgion) in Istanbul.

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The prison cells of Christian captives, probably at Yedikule fortress (Heptapyrgion) in Istanbul.

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The Yedikule fortress. In the background Hagia Sophia and the Mosque of Sultan Ahmet I.

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The entrance to Yedikule fortress.

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View of Istanbul.

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Map of Istanbul.

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View of Istanbul.

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View of Istanbul. 1. Heptapyrgion or Yedikule castle 3. Fenerbahçe quarter. 4. Port of Kadiköy. 5-6. Scutari palace. 7. Tower of Leander. 8. Port of Scutari. 9.10 Tophane quarter and street market. 11. Galata and Pera district. 12. Shipyards of Kasımpaşa. 13. New Mosque (Mosque of Valide Sultan) 14. Palace of Porphyrogenitus.

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Imaginary depiction of the castle of Yedikule or Heptapyrgion (a prison in the Ottoman era), in Istanbul.

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View of Yedikule (Heptapyrgion) fortress, Istanbul.

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