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Photo: Lena Dyrdal Andersen, CC BY-SA 3.0 via Wikimedia Commons
Built in 1862 and still in use. It is 35 meter and stands on a 27-m mound giving a fantastic view of the surrounding countryside as well as the sea.
© OpenStreetMap contributors
North Sea Oceanarium
Among the biggest aquariums in Europe, with a massive 22x33 metre aquarium with more than 4.5 million litres of water and 2-3,000 fish from the North Sea. There is also a big outdoor aquarium with seals and a show area, and several smaller habitat and theme tanks.