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From Spain to Scotland and Sri Lanka, these are the most incredible works of manmade fortification that are still standing strong today, so you can visit them with Culture Trip on our small-group adventures.

About the author

Gethin Morgan has developed an exciting portfolio across a series of roles at Culture Trip. With a keen interest in food and drink, Gethin is also particularly interested in niche or alternative travel which, in his case, usually involves following the Wales national soccer team to Europe's most obscure cities.

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