We all love the Disney movie about the mermaid, but did you know that haunting music can be made under the sea for real? It can, in Croatia, anyway. Made from a leftover relic from WWII, this organ works by using wind and water to make its noise. Water flows into the different cavities and produces haunting notes that, with help from the waves, make beautiful music that will stick with you. It is not a popular tourist spot. More info: zadar.travel
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