Fortezza di Monte Altura

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Standing sentinel on a rocky crag, this sturdy 19th-century bastion was built to help defend the north coast and Arcipelago di La Maddalena from invasion – something it was never called on to do. A guided 45-minute tour leads you to watchtowers and battlements with panoramic views out to sea. The fortress is signposted off the SS125, 3km west of town.

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