This unique geological phenomenon lies close to Sami of Kefalonia. A part of the roof collapsed and a wonderful landscape was created and rediscovered in 1951. In the afternoon, the sunbeams get through this natural window creating an amazing feeling in the chilly cave. The depth of the water goes down to thirty meters while the stalactites and stalagmites are aged 20.000 years back!! In the center of the lake, there is a tiny island on which ancient findings were found showing the relationship of this cave with the ancient God Pan, god of music and wild.