St. Nikola's Fortress is a fortification structure built on an islet facing the entrance to St. Ante's channel and Sibenik port. The fortress was designed by the Renaissance architect from Brescia, Michele Sanmicheli. It was built on two levels, the space with cannon openings at sea level which is vaulted with extensively spanned vaults and a plateau over the vaults with military structures on it, the captain's quarters and a small chapel.

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