Dive down into the crystal clear waters of Albania's Blue Eye, a natural spring that extends down to an as yet unknown depth. This gives the center of the spring a deep blue color, almost like a pupil that lightens around the perimeter like an unblinking, hypnotic eye - hence the name of this unique natural phenomenon. But perhaps the most compelling thing of all is simply not knowing what secrets ultimately lie deep below the surface. It provides an experience that is both chilling and exhilarating at the same time and shouldn't be missed.