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Drottningskärs kastell

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Drottningskars Fortress outside Karlskrona, Sweden.

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Bristling with cannons, this fortified tower on the island of Aspö was described by Admiral Nelson of the British Royal Navy as ‘impregnable’. You can visit it on an Äspoleden, a free car ferry that runs up to twice hourly in July and August from Handelshamnen, north of the Marinmuseum.

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