For wild swimming trip in Grotta della Poesia

While many of our planet's natural pits and crevices are dank and inhospitable, some contain

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inviting pools of crystal-clear water, are surrounded by spectacular scenery, and might even have a waterfall for showering off afterwards. Whether you fancy a dip in a sinkhole, a cave or a cliff-side cranny, TripAdvisor's latest list of the world's best natural pools should have you covered. "You have to see this place to believe it -- when I first saw the pictures I wasn't sure it was real!" says TripAdvisor user Chaitdesh from London. The too-good-to-be-real Grotta della Poesia is in Roca Vecchia, an important Bronze Age and Mycenaean archaeological site. Sitting on the Adriatic coast, the grotto is made up of two turquoise and blue karst sinkholes. "When I arrived at the natural pool my breath was taken away by its beauty," says Joan R from New York City.