The book from the popular “100 Greats” series tells about the most amazing, exciting mysteries and secrets of inanimate nature, flora and the animal kingdom, as well as incredible, but very real creatures, more like characters from myths and legends. The Tunguska “hall of sarcophagi” and the Baltic “geysers”, singing dunes and fire-breathing ghosts, giant grass and miracle cacti, relic lizards and the marsupial devil, Mokele-mbembe and the roc bird... Everything unknown, little-studied and difficult to explain makes people think about the mysteries our world, provides plots for science fiction novels and films, encourages scientists to undertake scientific research and expeditions, and amateur enthusiasts to make bold guesses. The future increasingly poses the question: will people find ways to decent coexistence both with each other and with the natural world, or will humanity plunge into the abyss of climate, genetic and psychotronic wars?