In 1980 Michael Harner blazed the trail for the worldwide revival of shamanism with his seminal classic *The Way of the Shaman.* In this long-awaited sequel, he provides new evidence of the existence of another reality. Drawing from a lifetime of personal shamanic experiences and more than 2,500 reports of Westerners’ experiences during shamanic ascension, Harner highlights the striking similarities between their discoveries, indicating that the heavens and spirits they’ve encountered do indeed exist. He also provides instructions on his innovative core shamanism techniques, so that readers too can ascend to heavenly realms, seek spirit teachers, and return later at will for additional healing and advice. Written by the leading authority on shamanism, *Cave and Cosmos* is a must-read not only for those interested in shamanism, but also for those interested in spirituality, comparative religion, near-death experiences, healing, consciousness, anthropology, and the nature of reality. “*Cave and Cosmos* is bound to become a classic in the global renaissance of shamanism that Michael Harner initiated with his earlier *The Way of the Shaman*. His new book is a treasure trove of information on core shamanism, with conclusions based on personal accounts of more than 2,500 Westerners who experienced shamanic ascension. —Stanislav Grof, MD, author of *Healing Our Deepest Wounds* and *When the Impossible Happens* “Not since Eliade’s *Shamanism* and Harner’s *The Way of the Shaman* has there been a more valuable contribution to the field than *Cave and Cosmos.* Definitely a classic for all time.” —Angeles Arrien, PhD, anthropologist and president of the Foundation for Cross-Cultural Education and Research “Harner shows us with startling clarity the entire spiritual cosmos of shamanism and how to work together for the good.” —Edith Turner, author of *The Hands Feel It* and coauthor of *Image and Pilgrimage in Christian Culture*