A spring of unknown depth erupts from the earth in a pupil of impossible blue ringed by dense forest — the Syri i Kaltër, or Blue Eye, is southern Albania's natural wonder. Divers have passed fifty metres without finding bottom. The water is a breath-snatching 10°C, which makes the plunge brief and legendary. Pair it with the Ottoman lanes of nearby Gjirokastër.
Featured in Ten wild swimming and water adventures across Europe · Adventure