San Sebastián Aquarium: 360-Degree Shark Tunnel & Naval Museum
★4.1(16)
Walk through the transparent tunnel while bull sharks and rays circle directly overhead—it’s the clear highlight here. The upstairs section leans heavy into Basque maritime history, so skip the long reading if you’re just here for the jellyfish and seahorses. Plan for 90 minutes right before sunset; the building sits on the harbor’s edge with a killer view of La Concha. Grab a skip-the-line ticket to dodge the school groups during peak summer hours.
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