The caves of Diros are set along a beautiful bay on the south side of Areopoli, an archaeological site down the west side of Mani region of the Peloponnese peninsula, Mani. Investigated in the 1950s by Ioannis and Ioanna Perochilou, these caves are remarkable both for their natural features and archaeological significance. Vlichada is considered one of the most beautiful caves worldwide, with a depth of 3.5 kilometres. Many animal fossils dating around 2 million years old were found here. Pink, red and white colours characterise different parts of the cave. (Note: this may be the only one of the Diros caves open to the public). The other important Diros caves are Alepotripa, which was inhabited some time 5,300 years ago, and was also a burial spot of sorts. The cave revealed ceramic statues, marble relics, animal bones and more, many of which are on display nearby at the Neolithic museum of Diro. There is also Katafigi, considered the third cave of Diros 500 meters away from Vlichada. This cave has an area of 2,700 square meters. In addition to being inhabited by early farmers, this site was used for burial and cult purposes. Archaeological evidence has revealed that this is one of the largest Neolithic burial sites ever found in Europe. Two adult human skeletons were found at the site from a burial dating to the 4th millennium BC, as well as remains from at least 170 separate persons. Archaeologists are uncertain about the significance of a Mycenaen ossuary, which has been dated to the 2nd millennium BC and appears to have been reburied at Alepotrypa. While there is no direct evidence, it is possible that the ossuary may link Alepotrypa to Tainaron, which was regarded as the entrance to Hades in classical mythology.