Opalsøen (The Opal Lake) in Allinge, Denmark

From the mid-1800s to 1970, this lake served as one of Denmark’s largest granite mines, shipping granite to various locations across the country from the nearby harbor. Following its abandonment, water accumulated, giving rise to one of Denmark’s most recognizable lakes. Featuring crystal-blue waters and surrounded by the scenic hill of Hammeren, it stands out as one of Denmark’s finest unnatural wonders. With a surface height of approximately seven meters, this former granite mine has become a premier location for cliff diving in Denmark. Every year, thousands of visitors plunge…

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