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The world’s first underwater roundabout, with a jellyfish-like central pillar, is in a tunnel between two of the Faroe islands: Streymoy and Eysturoy. The “Eysturoyartunnilin” is due to open officially on December 19, 2020. – WTF Fun Facts

Source: Giant underwater ‘jellyfish’ roundabout becomes latest Faroe Islands tourist attraction | Faroe Islands holidays | The Guardian