The Drogarati Cave in Kefalonia was discovered 300 years ago and opened to the public in 1963. Drogarati is an impressive cave with remarkable formations of stalactites and stalagmites (they grow at an estimated rate of 1 cm over 100 years, and although many have now been broken by earthquakes and human activity they still offer an enchanting sight as one descends into the cave). The cave’s depth is 60 meters from the ground level, the temperature is 18 C (64 F) and the humidity is 90%. According to archaeologists, Drogarati cave is over 100 million years old. The cave is incredible. Look at photos.