San Antón began on a small island in the bay, separated from the city it was intended to defend. Fortress construction started in 1588, and its layout reflects the need to control the harbour entrance. Before its twentieth-century connection with the mainland, reaching it required a boat. Its purposes changed over time: defensive position, prison and, since 1968, archaeological and historical museum. This transformation links military architecture with Galicia’s past, including objects from hillfort culture and the Roman period. From outside, consider the relationship between location, water and surveillance. Municipal notice of 30 September 2026: the museum closes temporarily from 6 October for electrical renewal. The council will announce reopening; check before planning an interior visit.
Sources checked on 17 October 2026. Opening and access may change. The walk does not include admission; allow extra time for interiors. Routes have not been audited for accessibility.
Plan this visit
Plan around the works notice
The municipal statement of 30 September 2026 announces temporary museum closure from 6 October and says reopening will be announced. We have not found confirmation allowing the interior to be treated as available on 27 October. Before planning collections, check the current notice rather than relying on old opening times.
Keep an independent exterior reading
When the surroundings permit, observe from an authorised promenade how the fortress sits in relation to water and the port entrance. This does not replace the museum but explains its defensive position without entry. Do not cross works areas or assume a library activity means general castle opening. Prepare another interior if archaeology was your main goal.
