The caves at Sante Salt Cave & Healing Spa may be manmade, but they're based on one of nature's most fascinating healing places. Like the salt mines that occur naturally deep in the earth, each cave is stocked with 12 tons of Himalayan pink salt. The salt is kept at the same temperature and humidity as it would be found down below, which allows the salt's natural air-filtering properties and negative ions to be released. These negatively charged ions are thought to naturally improve guests' health and mood, helping them breathe deeper and feel calmer. Even those who don't seek to venture into the caves, however, can find other holistic approaches to their health at Sante Salt Cave & Healing Spa, including massages, flotation therapy, as well as yoga within the cave.