The Cave of the Lakes is located near the village Kastria of Achaia and is one of the rarest natural attractions with labyrinthine corridors, large galleries and unique stalactite formations. In the cave entrance was discovered a significant number of Neolithic oyester and EH years and found deposits of Late Neolithic times. The successive cascading of spanning to three distinct levels is not detected in any other cave in the world. Of particular importance are the paleontological findings identified as fossilized human bones and animals, including the hippopotamus, which is of paramount importance at international level. The second floor of the cave was explored for the first time in 1964 by the Greek Mountaineering Association and the participation of the villagers. Indeed they needed a 9 meter stair to help the group to reach the floor. In winter time, the increased flow of water fills the cave and it becomes a huge underground river. Natural waterfalls on corners create unique and unusual images. Conversely, in summer the waters recede and emerge natural stone basins with lacy patterns. The natural lakes formed, reflect the roof formations and compose an unparalleled spectacle. Chandeliers, jellyfish, curtains with unique folds are just a few of the known speleological formations that one meets in this cave.